Can't Save File Error, I/O error, Program Error - Adobe Photoshop

GB,

Did you apply the latest Apple Security Update? If so, run Cocktail, Repair Disk, Repair Permissions and DiskWarrior.

I had seen some flakiness after applying the update, including a strange turtle-dove sound about which I posted here.

Well, that night I ran all of the above, and the sounds stopped, as did all the other anomalies I had noticed. To the best of my recollection, the blurb to the update says something about fans, so it's not that far fetched. I have not heard the sounds since. (Knocking on wood.)

My guess (nothing more than speculation) is that the update does not leave things quite as they should be.

I have still not installed that update.

Among the flakiness being reported are myriad problems with MS Office programs although some people have apparently solved them by trashing a bunch of MS Prefs..

Security Update 2006-007 is the only thing that comes up in SoftwareUpdate so I didn't run it on either G4

Seeing is believing (on two machines here) so maybe there's something going on -- it's very annoying...

I would follow Ramón's advice and run both DiskWarrior and Cocktail without further delay, if you haven't yet done so, because you could easily have header/directory corruption on your HDs.

I never use 3rd-party disk utilities -- I would rather Erase and clone back my good backup -- but that's good advice for fixing problems that Disk Utility can't fix...

GB,

You are missing out on some good stuff if you don't use Cocktail. It can do things Disk Utility can't.

Where would Apple be without 3rd party utilities?

Just think of font managers, for starters.

Cocktail is okay here...I am talking about DiskWarrior, TechTool (and Norton in the old days).

Though your mileage may vary...

DiskWarrior is a necessity, GB. Not to run it routinely, but in many situations, nothing else will give you a hard drive back.