since i haven't found a similar thread to my problem i think maybe my problem has something to do with the "autogenerated not shown addresses" Satoshi mentioned before.
Well, for some time i noticed that sometimes an autogenerated receiving-address is added to my addressbook with no description at all.
Today just after noticing the (already second one of this) i closed the addressbook and reopened it again and suddenly there was a new one. Now i have three of those.
I'm not sure if it was because i got bitcoin in the timeframe or there is just a bug in the GUI of the addressbook window.
Anyone else experienced this bug, or maybe this is a "normal" behaviour which i haven't found in the docs yet?