Please describe the problem:
The GIMP 2.45, GNOME 2.22.2, Ubuntu 8.04 64 bits, ATI Radeon x1200. 
I haven't been able to reproduce the bug, but it happened 5 times:
I had 4 (non large) images open, three of them with several layers, some saved flattened (but not closed), some unsaved.
When I tried to "save as" the save dialog appeared empty and didn't show any option at all.
I have had the gimp running for a while and been working with a lot of files (xcf's, jpeg's and gif's) mostly resizing, cropping and changing color modes.
I made new files, copied the layers from the (non "saved-as" image), then saved.
After that i had to go and haven't had time to reproduce.

Steps to reproduce:
1. open several files.
2. crop, resize, change color modes, select, duplicate and create layers.
3. save some images, then try to "save as" the same images. 


Actual results:
the "save as" dialog appears empty and doesn't show any options at all, therefore image wouldn't save as a different file.

Expected results:
the image to be saved as a different file

Does this happen every time?
no

Other information:
Please let me know if this kind of bug report is useless so I won't do it again.