Picking 'Save' from File menu or Ctrl+S sometimes not saving!

[Speedster]

I've had this happen several times with KS 5.  Rather than "Save As", several times during a session I "Save", then go into Win Explorer and create a "Copy Here" and name it to suit.  Just a safety backup.  That way I create a backup without changing or risking my Master file.  What I've experienced is that, but only with really large files >3GB, it may freeze up during the save.  The only way to get out is by ending the task in the Task Manager.  But then the .bip is empty, with all work, models, environments, ALL, lost.

So my practice with large files (never an issue with smaller)and especially critical client files, is the diligent copy process.

Bill G