I have been a long time NOF user for my personal sites since the late 90's. So have experienced the ups and downs and frustrations with the various versions. Currently have NOF 12 build 5071 on Windows 8. I originally built current site in NOF 11 and had been updating it now and again since I migrated it to NOF 12 mid 2011. Had been performing OK with no issues until now.

Added a new page and set up a new photo gallery, added photos and captions and saved as I went. All seemed good and I added more photos and then message popped up "NetObjects Fusion 12 has stopped working. A problem caused the program to stop working correctly. Windows will close the program and notify you if a solution is available. CLOSE PROGRAM"

Clicked on CLOSE PROGRAM (no other option provided) which closed NOF. I went to reopen site and got message "NetObjects Fusion has detected an unstable file and will now recover your site. The time required for this process will vary. If you exit now, NetObjects Fusion will recover your file the next time you open the site."
Proceeded to open the site and got message "NetObjects Fusion: Recovery was successful. You might need to redo recent changes."

I went on to add more photos until the above scenario repeated itself a few times. I tried deleting all the photos and adding them again with no improvement. I "Re-Optimized" the site, checked all assets and once again tried to add more photos and again NOF 12 crashed.

Went into other Photo Gallery pages that had previously given me no issues and now they are now suffering from the same issue.

I have no idea what is causing this or how to cure - please help!!!