yeh, i had a similar problem a while back.
Originally Posted by jyms
PS support reckoned it was down to a corrupt user.ini file:
"Generally if any local personalized settings cannot be saved from session to session, the cause is commonly a corrupt "user" or "user.ini" file. The file is the same and may just appear with/without the file extension depending on your computer settings.
To resolve this problem, you should delete or rename the file "user.ini". You may locate this file by opening the main lobby and clicking on "Help" -> "My Settings Folder". Once you have located the file first close the PokerStars software and then delete or rename that file. Then restart the PokerStars software and a new "user.ini" file will be created.
Please note that one potential cause of a corrupt user.ini file is having a large number of player images blocked individually.
If you have made it a habit to block each player image you encounter, this problem may recur unless you limit the number of images you choose to block. Our software team is aware of this potential problem."
i can't verify the above, as the problem sorta fixed itself when PS released the next update