I have also had this problem with the language going "walk about" on OpenACS 4.5, PG 7.2.3 and RH 6.2. I didn't find a solution - as it was just a test installation I reinstalled. I was using Jerry Asher's multi-site hosting with AOLServer 3.3+ad13, and hosting two development sites. I had just restarted AOLServer numerous times (the master server was having difficulties seeing the socket file).