I have installed:

**MicroStation CONNECT Edition**

10.15.0.74

**MicroStation CONNECT Edition SDK**

10.15.00.076

Our application consists of 3 complex command dlls, each of which creates, uses, and frees several * SymbolSet*s. We encounter consistent but random crashes with calls to

*for workflows that execute command sequences that jump from one dll to the other*

**mdlCExpression_getValue()***(but not if you only execute commands from a single dll.)*

Unfortunately I can't readily provide a simple test case due to the complexity and randomness of the problem.

Below is a typical stack seen inside * exceptions.log*. Since I don't know much about how the

*API manages memory I'm not sure how to interpret this stack nor how to go about debugging the problem.*

**mdlCExprssion**Any advice would be appreciated.

Thanks,

John M.

**Call Stack**

0: 000000bb591fc130 000000006ddadfce 000001f78270b290 000000006e3fde40 000001f7dd3f6970 000000006ddf0c03 mdlSymbols_getList+0x340 1: 000000bb591fc160 000000006ddaed28 000001f782ecee68 00000000ffffffff 000001f7dd3f6950 000000006e3fde40 mdlButtonMap_setNoInterpretArea+0x3fe 2: 000000bb591fc1a0 000000006ddef33f 000000bb591fc220 000001f782ecf2b8 00000000ffffffff 000001f7dd3f6950 mdlCExpression_publishTrustedFunction+0x18 3: 000000bb591fc210 000000006ddefd76 000001f782ecee68 000001f782eceef8 000001f782ecf2b8 00007ff913de12b8 mdlCExpression_isWCharPointer+0x23bf 4: 000000bb591fc260 000000006ddf08ab 0000000000000052 000000bb591fc310 0000000000000000 000000006dded149 mdlCExpression_isWCharPointer+0x2df6 5: 000000bb591fc2b0 000000006ddf0394 000000bb591fc780 0000000000000000 000000000000002b 0000000000000000 mdlCExpression_isWCharPointer+0x392b 6: 000000bb591fc330 000000006ddefb5e 000000bb591fc780 0000000000000000 0000000000000000 0000000000000000 mdlCExpression_isWCharPointer+0x3414 7: 000000bb591fc380 000000006ddf0284 0000000000000000 000000bb591fc780 000000bb591fc780 000000bb591fc439 mdlCExpression_isWCharPointer+0x2bde 8: 000000bb591fc3e0 000000006ddef89a 0000000000000000 000000bb591fc460 000000bb591fc780 0000000000000000 mdlCExpression_isWCharPointer+0x3304 9: 000000bb591fc470 000000006ddef774 0000000000000000 000000bb591fc780 0000000000000000 000001f7abf3fa70 mdlCExpression_isWCharPointer+0x291a 10: 000000bb591fc4d0 000000006ddef5b4 0000000000000000 0000000000000000 000000bb591fc780 0000000000000000 mdlCExpression_isWCharPointer+0x27f4 11: 000000bb591fc530 000000006ddf09a4 000001f782db4380 000000006dbbeb8c 000000bb591fc780 00007ff916dda3db mdlCExpression_isWCharPointer+0x2634 12: 000000bb591fc590 000000006ddef694 000001f7829767b8 0000000000000000 0000953aa182e9f1 000000006db9ae70 mdlCExpression_isWCharPointer+0x3a24 13: 000000bb591fc5f0 000000006ddefa50 000000bb591fc6c0 000000bb591fc780 000000006e5519f0 0000000000000000 mdlCExpression_isWCharPointer+0x2714 14: 000000bb591fc650 000000006ddf00fb 0000000000000131 000000000000006c 0000000000000000 000000bb591fc890 mdlCExpression_isWCharPointer+0x2ad0 15: 000000bb591fc6b0 000000006ddf0e34 000000bb591fc858 000000bb591fc780 000000bb591fc890 0000000000000000 mdlCExpression_isWCharPointer+0x317b 16: 000000bb591fc700 000000006ddf0d80 00000000ffffff00 000000bb591fc780 000000006e5519f0 000000006ddf18f8 mdlCExpression_isWCharPointer+0x3eb4 17: 000000bb591fc750 000000006ddaeaac 0000000000000002 000000bb591fc858 000000bb591fc890 0000000000000002 mdlCExpression_isWCharPointer+0x3e00 18: 000000bb591fc7a0 000000006ddaea4b 000000bb591fc828 000000bb591fc858 000000bb591fc890 000001f7abf3fa70 mdlCExpression_getValueForApp+0x4c 19: 000000bb591fc7e0 00007ff8800a2b6e 000001f7abf40010 0000000000000000 0000000000000000 0000000000000000 mdlCExpression_getValue+0x3b 20: 000000bb591fc9c0 00007ff88009c45a 000001f7fd212000 cccccccccccccccc cccccccccccccccc cccccccccccccccc MdlMain+0x21001 21: 000000bb591fca20 00007ff88009b2c6 000001f7a9ca0980 cccccccccccccccc cccccccccccccccc cccccccccccccccc MdlMain+0x1a8ed 22: 000000bb591fca70 00007ff88009b6d4 000001f7a9ca0980 000001f782b9a8b0 0000000000000000 cccccccccccccccc MdlMain+0x19759 23: 000000bb591fcb70 000000006dba20f3 000000bb591fcc30 0000000000000000 0000000000000001 00007ff900000000 MdlMain+0x19b67 24: 000000bb591fcbf0 000000006dc1f907 000001f7a9c72320 000001f782b9a8b0 000001f782b70120 0000000000000001 mdlDialog_hookItemCall+0x133 25: 000000bb591fcd30 000000006dc1f6ff 000001f7a9c72320 0000000000000000 000001f7a9c72320 0000000000000000 ListBox::SetTopRow+0xe0a7 26: 000000bb591fcdc0 000000006dc26b76 000001f77fffffff 000001f7a9c72320 000001f700000000 000000000000001e ListBox::SetTopRow+0xde9f 27: 000000bb591fce10 00007ff88009b618 000001f7abf40010 0000000000000000 0000000000000000 cccccccccccccccc mdlDialog_listBoxSelectCells+0x66 28: 000000bb591fcf10 000000006dba20f3 000000bb591fcff0 0000000000000000 000000bb591fcf01 000000bb591fcff0 MdlMain+0x19aab 29: 000000bb591fcf90 000000006dbb7c70 000001f7ddc23da8 000001f7a9c72320 000001f7dd0aec40 000001f7abf3f550 mdlDialog_hookItemCall+0x133 30: 000000bb591fd0a0 000000006dbb8fbd 0000000000000000 0000000000000018 000001f782e2c5d0 0000000000000000 mdlDialog_updateNativeMenuTitle+0x730 31: 000000bb591fd140 000000006dc66b11 0000000000000000 000001f7a9c6f5a8 0000000000000032 a400000100000000 mdlDialog_updateNativeMenuTitle+0x1a7d 32: 000000bb591fd1e0 000000006dc6b5ea 000001f700000000 0000000000000000 000000bb591fd3a0 000000bb591fd299 Bentley::MstnPlatform::GuiLayoutTabPageList::SetGeometry+0x5771 33: 000000bb591fd2f0 000000006db97a64 000000bb591fd3a0 0000000000000032 000000bb591fd3a0 000000006db9790f mdlDialog_tabPageSetLayoutManager+0x88a 34: 000000bb591fd340 000000006dbba68b 000001f7dd0aec40 000000006dc6b570 000001f7dd0aec40 000001f7a996fb10 mdlDialog_itemMessageSend+0x114 35: 000000bb591fd560 000000006dbba503 000001f7824a6b01 000001f7a996fb10 0000000000000000 0000000000000000 mdlDialog_rItemChildCreateWithRFileOpt+0x15b 36: 000000bb591fd5d0 000000006dbb8e0e 000001f782e2d4b0 000001f7ddb67084 000001f7824a6b20 0000000000000002 mdlDialog_rItemChildCreateWRscAndRFileOpt+0x113 37: 000000bb591fd670 000000006dc63e84 000001f782b9a8b0 000001f7ddb67058 000001f7a996f000 0000000000000000 mdlDialog_updateNativeMenuTitle+0x18ce 38: 000000bb591fd720 000000006db97a64 000000bb591fd7d0 0000000000000000 000001f7824a6701 0000000000000000 Bentley::MstnPlatform::GuiLayoutTabPageList::SetGeometry+0x2ae4 39: 000000bb591fd770 000000006dbb7c4e 000001f7dd0aec40 000000006dc6adc0 000001f782b70120 000001f782704b00 mdlDialog_itemMessageSend+0x114 40: 000000bb591fd880 000000006dbb8fbd 0000000000000000 0000000000000008 000001f7828222f0 0000000000000000 mdlDialog_updateNativeMenuTitle+0x70e 41: 000000bb591fd920 000000006dba700b 000001f782b70120 000001f782975a58 000000bb00000019 000001f700000000 mdlDialog_updateNativeMenuTitle+0x1a7d 42: 000000bb591fdc00 000000006dba7d10 000001f700000000 0000000000000000 000000bb00000001 00007ff800000001 mdlWindow_undockWindow+0x9eb 43: 000000bb591fdcc0 000000006dbad4bb 0000000000000001 000000bb591fdf80 000000bb591fdd44 0000000000000000 mdlWindow_undockWindow+0x16f0 44: 000000bb591fdcf0 00007ff880088e1b 000000bb591fdeb0 00007ff880081e88 00007ff880081e88 cccccccc00000005 mdlDialog_openModal+0x2b 45: 000000bb591fde30 000000006dfb5535 000000bb591fdeb0 00007ff880081e88 000001f7ddaffc01 0000000000000000 MdlMain+0x72ae 46: 000000bb591fde70 000000006dec0116 000001f7e554c850 000000006e5618a0 000000bb591fe8c0 000001f7e554c850 SaveAndSwitchMdlDesc::~SaveAndSwitchMdlDesc+0xae5 47: 000000bb591fe860 000000006dec3645 000000bb591fe8c0 0000000000000001 000001f78296e1e8 000001f7829767a0 priorityGui_initialize+0x8e6 48: 000000bb591fe890 000000006dd5a3b4 000000006dd5bb30 000000006dd5bb30 0000000000000000 0000000000000000 mdlInput_processQueuedInput+0x25