To quote Jerry (more on him when he opens his blog soon...), this is apparently what happened to my amgr today. I was getting some freaky "cannot find external name: CONVERTTEXTDATE" errors with some agents. It wasn't just happening with a particular custom workflow database. It was happening with a CRM db and several Lotus Workflow databases. Well, I initially thought that if I recompiled all LotusScript that it would fix it. Nope! After that didn't work, I decided to just TELL AMGR QUIT and then LOAD AMGR. Seems the errors went away after that. After I told Jerry he just said that "amgr lost its mind".
I think he was right on that one!