Backup your php.ini Plesk 7.5.4 update overwrites it!!!

[mazeman]

On every Plesk update I cross my fingers that 80% works ... 7.5 messed up plesk's own mysql tables.

I never had a successfull update, 7.5.4 was no exception, php stoped working.

changing it to:
output_buffering = On
fixed it

Had to change my antivirus to ClamAV since DrWeb now sends 1000's of emails to my mailbox.

I hope that they SWSoft makes a reliable product by version 10.