>So you really want to uninstall 7.3 and go back to 7.2.4 now.
first of all, thanks for the quick response!
now: i've done that already and 7.2.4 is running just fine (as user pgsql...)
at the moment i'm inclined to agree with you to forego the ports for installing postgresql and follow the instructions at openacs.org 
HOWEVER: these instructions don't mention anything of a pgdriver AT ALL?!
since you -- obviously -- have already successfully installed postgresql and openacs without using the ports collection, what would you suggest to do next?
again, thanks for your time!