We just migrated successfully from phpBB2 to vBulletin latest stable version. I've been trying to use bridge manager and at the end of it, if I try to access any cpg page I get the 'Coppermine critical error: unable to connect to udb database' error. I've checked the database, tables, permissions, config files, etc. Everything looks ok, I think.
What do I look for next...?
cpg1.4.2 is totally outdated - most recent stable release is cpg1.4.14, so you're running 12 versions behind. There is a sticky thread on this board that is named "When requesting bridge support - mandatory! (http://forum.coppermine-gallery.net/index.php?topic=24032.0)" for obvious reasons. There is a section in the docs that is named "Bridging support (http://coppermine-gallery.net/demo/cpg14x/docs/index.htm#integrating_support_start)" for obvious reasons. Upgrade your gallery to cpg1.4.14. If your issues persist, do as suggested in the sticky and docs.