Authority problem after V5R2 upgrade

Hiya,

we have upgraded our 820 from V5R1 to V5R2 over the weekend.

One remote user doing FTP was getting a logon rejected (530) message at 
FTP-signon. The message also said he couldn't switch to library CV00C00 
because
of authority problems.

Now, our user liblist has CV00C00, QGPL and QTEMP. Looking at the 
authority, all libs show public *change. I gave the problem user (FTPATL) 
specific
*change access - now it works.

Now the really strange thing. Library CV00C00 has an authority list 
attached, but it isn't used, as public authority is *change and not *autl.
In the unused autlist user FTPATL had all authorities, but not *objexist.

When I removed FTPATL from the autlist and set CV00C00 authority to public 
*change again, the FTP works.

So, to me, it looks like before the upgrade, lib CV00C00 had the autlist 
and also the public *autl setting. During the upgrade, public *autl was 
lost somehow,
but some internal pointers still checked the FTPATL authority from the 
autlist.

Any ideas how this could happen? Anybody seen this on other V5R2 upgrades?

Regards,

Oliver