Thanks Corky and Allen- I very much appreciate your constructive suggestions.
Corky, I had a look for those plists, nothing showed up.
I'll have to juggle some drives before I can free one up for a Time Machine backup, so that might take a little time.
However, it does seem like it might be worth the effort.
Allen, I'm using an external Firewire drive to reference all files. That disk is manually backed up to another drive, unconnected to Aperture.
The only thing that I would imagine to be different in my workflow is that I have a few quite large files- stitches, and film scans- which are quite a bit larger than those more commonly used. 650Mb is not unusual, larger are possible, and Aperture was never happy with those.
This problem, as I mentioned in my first post, is intermittent. It doesn't present itself all the time. I've just had a month where it hasn't been a problem, and lately, a few days where I had to force quit every time I opened. Then the Time Machine bug started happening again, which necessitated restarting the computer, which then failed to re-start, and required a hard shutdown. Multiple times.
Whatever the problem is, Aperture is at the centre, either the cause, or the program most affected, of and by the problem.
I'm not near an Apple Store, can't make an appointment to get a genius to plug it into diagnostics.
I'm loath to send the machine away, but might end up having to do that.
Thank you both for your suggestions, I'll be taking your advice on them. Thanks also for not being offended too much by my ranting, believe me, I have searched for this problem, and haven't found it referenced anywhere. Hence my frustration. Being advised to cease posting seemed to be a strange way to be helpful, seemed to be more like a policeman than a problem solver.
Much appreciated.
joseph