Can no longer copy files between internal drives or from burned DVD's

This just started today as far as I can tell. We have 4 dual 2.7GHz G5's running 10.4.4. Two of them seem to work as normal. The other two won't let me drag/copy files from one of the internal drives to the desktop or the other internal.
We have two internal drives, the one with OSX on it that works fine as in I can copy/drag files to the other internal drive (labeled "AV") or to the desktop. The AV drive won't let me copy/drag any files to the desktop or the other internal, I get the circle with a line through it. Also when I burn a DVD I can't copy/drag the files anywhere on any drive. If I put a previously burned disk (burned prior to today) in I can copy it fine to any drive.
I have verified/repaired all disks, repaired permissions, and checked read&write permissions.
Any help?

OK, I figured it out (I'll admit to being a Mac n00b). I was using DVD+R's. So the act of trying to copy files from a DVD+R (even though it was burned in the same G5) changes something in the drives so nothing on them will copy.
Ejecting the DVD+R and restarting without the disk in it got it back to normal. The problem was reproduced when I tried the DVD+R again (just to confirm the issue and solution). Again a restart fixed it.
Moral of the story, don't use DVD+R in Macs even though they can burn to them.
Anyway, if anything hope this post can help other n00bies.
G5 Mac OS X (10.4.4)

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I use Back To My Mac to connect between a Mac Book Pro and Mac Pro. These two machines have the same home directory name, but different passwords. My home network is on an Apple Airport Extreme.
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I'm having the exact same issue, did you find a solution. It's annoying!

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I am quite a simple soul really and very easily pleased.
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{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
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based Mac, and also if one has or had a BootCamp partition and
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ful action circles-with-lines, or action disallowed warning symbols?
There must be a simpler answer. Do you have cats which have
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Some have been thought to have technical skills outside of the
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I'm sticking to the cats theory for now; the time is 3:21AM here
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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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Can no longer copy files between internal drives or from burned DVD's

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