OK, I've tracked down the problem, and it doesn't seem to be memory related, although I will try to pair all the Mac minis with another 1GB of RAM soon.
As stated above, the crash occurs during loading. Last thing I see on the splash screen is 'Building Twain Menu Items' or something similar: goes by too fast to say for sure) then
CRASH.
I went to the plug-ins folder and deleted the Twain driver/plug in, and now the program launches and seems to work. I do not yet know how well it will function without a Twain driver, but for now at least I've got it working.
Still no response from Adobe so I'm not sure what the conflict is. Other than the standard OS programs, I have only Firefox, Adobe programs (CS2 and CS3) and various scanner software (see below) loaded.
The scanner software all works and has not had any conflicts before, but just in cast the list is as follows:
-Dimage Scan v1.1.5 (for the Dimage Scan Multi)
-Epson Scan v3.01 (for Epson 4870)
-Epson Scanner Monitor
-VueScan v8.3.73 (for all other scanners)
I will do a search on the web to find out if others have had Twain related issues, but hope that this will help others who might be having similar issues.