Software Update - digital signature incorrect

I have several update packages that were consistently reporting the error:
*The update "xxxxxxx" can't be saved.*
The digital signature for this package is incorrect.
The updates are:
iLife Support 9.0.3
Java for Mac OS X 10.5 Update 4 1.0
Safari 4.0
Several other updates (eg. recent iTunes and QuickTime) downloaded and installed OK.
I tried all of the following to no avail:
Repair disk permissions
Reinstall 10.5.7 combo package manually
Delete Software Update preferences & cache files
Multiple restarts
Finally I tried running Software Update under a fresh admin account and they downloaded OK. (Different issue that the Java Update later said it couldn't install).
So seemingly this is related to something in my usual admin account. Does anybody know what other preference files I should look to delete, or any other hidden setting that is affecting the digital signature checking?

I tried all of the following to no avail:
Repair disk permissions
Guess Carolyn didn't notice this.
This was happening fairly frequently about a month ago when 10.5.7 came out. The Apple servers were overloaded apparently and some incomplete downloads occurred so some type of checksum prevented running the update. Waiting and downloading later seemed to be the best solution.
http://discussions.apple.com/thread.jspa?messageID=9456350&#9456350
So seemingly this is related to something in my usual admin account. Does anybody know what other preference files I should look to delete, or any other hidden setting that is affecting the digital signature checking?
Perhaps by the time you did all the troubleshooting steps, if you tried it from the original admin account it would have downloaded correctly.

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