User cannot open LBCX file after creating it?

I have two users, one on Windows 7, the other on Windows 10. 

Both are running the latest LEAP Bridge Concrete (version 19.02.03.33). 

They can create LCBX files, but get this error when attempting to reopen them:

The Windows 10 user tried renaming these files' extensions to LCB. That works, but only intermittently and rarely:

File1.LCBX was renamed to a LCB extension yesterday. Yesterday: didn't open. Today: opened. Today, 10 minutes later: didn't open.

File2.LCBX was renamed to a LCB extension today. Today: didn't open. Today, 10 minutes later: opened. 

Any ideas appreciated...

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