I've just downloaded and installed (on Win2Ksp4) version 01.00.40.0320 eng and found that after doing menu File->Open and starting to navigate to my image directory, I get to the point where only 13 out of 18 directories are listed in one particular path.
The path I get to is:
C:\Data\Incoming Downloads
One of the directories I want to get to (and is not listed) is:
C:\Data\Incoming Downloads\HolidayAstro
If I drag and drop a file from this directory, then do File->SaveAs and navigate back from C: down, all directories are listed. But, if I then go to File->Open, and (as originally) directories are missing.
So, bottom line, it looks like the file open dialogue is not populating correctly.
Simon.