Can no longer move or copy files between drives (not a newbie issue!)

Copying and moving files between internal and external devices, and external to external devices is no longer working.
*For the first time in my life, I get a "Circle with a Bar through it" when attempting to move or copy files.*
This doesn't happen between the two internal drives at all (though I'm worried it might start). It happens between two HFS+J devices as well as HFS+J and FAT32 devices. I can delete files, create folders, and in some instances where things are acting funny, copy to, but not from the device. A noticed side effect that is now happening is that I can no longer move drive icons (CDs, DVDs, HDs) to their upper-right hand corner position on the desktop, if they didn't start there. They don't drop there, just staying where they originally sat (under a list of desktop shortcuts and files). It does not matter if the drives are USB or Firewire, and this never happened previous to about a month ago.
I have done all the basic stuff -- verify/repair drives, reboot multiple times, mount & dismount, change connection ports, backed up-reformatted-and restored the smallest drive, fixed preferences (not at all relevant), Disk Warrior repair the devices, set all permissions to R/W, check all device related infos, researched on-line for a week... Nothing. I have even taken the devices to PCs, where they work perfectly, and as expected.
This issue is apparently either a corruption, or a bug induced by Software Update, in the part of the system that handles files and file structures, or possibly the _USB and Firewire_ interfaces.
I just need to know where all those relevant parts are in the system folders, so I can attempt to restore them from a backup previous to the last "Software Update," (to be sure. And to bring this one step closer to being solved).
A system restore really is not an option, as that would require nearly two weeks of re-tweaking everything from the system to every piece of software included (updating the system about 10 times via software update, reinstalling 90% of the actual software packages... and then updating those multiple times, looking-up all the serials that get killed, etc.)
I have to correct this fast, as we need to move the files from the work drives to the archive drives before we run out of room. So any help would be very appreciated... even if you only know where a few of the system components are located (it just might be one of those, causing the issue).
---TIA

{The last link in this post is most relevant, except for your recent finding.}
The reference was to the User permissions, per each; as when these
become corrupted, the simple 'repair disk permissions' and other
basic duties do not find an error with them. That is because there is
nothing really wrong with them from that standpoint.
Another odd error can happen if one is resizing partitions in an Intel
based Mac, and also if one has or had a BootCamp partition and
wanted to reclaim space. But not always. Thankfully, the only time
I tried Windows on a Mac, the media install disc was corrupted so
it just didn't happen. That was Virtual PC and Windows on PPC.
Tiger brought with it the ability to non-destructively resize partitions.
However, it was not thought to be successful in non-Intel based Macs.
The discussion on that matter came up a few years ago, so someone
has undoubtably tried that in a PPC and reported findings online.
When file sharing between user-account created content runs amok,
then the system(s) will not allow the content to be moved or shared.
So, if any shared user-account created content (including drives
initialized or handled without permissions ignored, clones wrong,
etc) are not the problem, then how does one explain these wrong
ful action circles-with-lines, or action disallowed warning symbols?
There must be a simpler answer. Do you have cats which have
access to your computers in the off-hours? They do keyboard.
Some have been thought to have technical skills outside of the
usual coy and cute play-acting people think they are limited to.
I'm sticking to the cats theory for now; the time is 3:21AM here
and I only am up to get a drink and look outside at +5°F. calm.
Mac OS X 10.4 Help: I can't move or copy a file or folder
http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh194.html
• _Rearranging Files (and renaming them)_ InformIT: Mac OS X unleashed
http://www.informit.com/library/content.aspx?b=MacOS_XUnleashed&seqNum=122
It is good to have a backup for the backup; plus a backup Mac.
Good luck & happy computing!
{ edited: was distracted }

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