so, i have to say something, hope it helps....
first i Exported my Hands from all my databases.
second i deleted all the databases.
third i deleted postgres 9.0 and installed 9.3 64bit Version.
fours i installed the new pt4 Version.
fifth i created a new database, and Import my exported Hands from before. this i did so with any databases i had before the update.
rebuild Cache for all and everything works fine!! and even a little bit faster then before the update
thanks