[MicroStation SS4] Missing network drives

Do the drives show up through Window explorer ? Not the MicroStation file open dialog. If they are not showing through windows explorer you may want to try and remap the drives and then see if that corrects the issue.

The drives do show in Windows explorer. And in any other programs file open dialog. Even Bentley Geospatial Administrator. The only place they don't show is in MicroStation and Bentley Map.

Which operating system are you using?
In this thread communities.bentley.com/.../97823 there was a similar report be it against an earlier version of MicroStation. Try Going to Workspace > Preference > Look and Feel and turn off the option ' Use Windows File Open Dialogs ' close and reopen the file and then turn the option on again, does it help in your instance ?

Could also see if restoredefaults help, see http://communities.bentley.com/products/microstation/w/microstation__wiki/8671.restore-microstation-to-factory-defaults

Forgot to mention, I'm using windows 10. Just recently upgraded to windows 10 and updated MicroStation and Bentley Map.

I tried the "Use Windows File Open Dialog" method but it doesn't help in this instance.

MicroStation V8i SS4 is certified for windows 10 so that should not be the issue. What about remapping the drives, did you try that ?