Check your load-data-model.sql and make sure you are loading postgres.sql. nMake sure your postgres.sql has the libraries pointing to their right location on your HD.
I've loaded fresh OpenACS installs many times sine June 1 and had no problems with the education module.
On the nuke problem, tell your AOLserver (on your DB pools) "ns_param logsqlerrors on", restart it, try to nuke again and post the SQL error here so we can have a better clue. AFAIK it's working but we may have missed something.
OpenACS final is coming... somethings delayed us, but final release should come next week.