Another odd thing is that I don't see any place to enter the master password anymore on the Password Maker Advanced Options dialog box.
This must be the cause of your problem. The only time it prompts me for my MP is when there is something entered into the MP box when toggling it.
Maybe it's a Windows vs. Linux thing. Here at home on Linux I see no place to enter theMP. I remember seeing it at work on Windows. I'll report back.
Can you see the 'I use more than one master password' option? Is it enabled?
Initially no. I tried toggling it on. It didn't seem to do any good.
Can you see the 'Store master password (on disk or in memory)' option? What is it set to?
Right now it says "Store". Likewise I click on it a few times to try all of the setting. Again, didn't seem to do anything. If I click it now it goes to "Clear" and says "Status of Global Hash Matches".
Can you see the 'Master Password Hash' section? Have you stored the Master Password Hash for whatever account you are on when you try to toggle?
It says "Master Password Hash" above the "Status of Global Hash Matches". I've both stored and cleared it.
It sounds to me like your RDF file may be hosed... have you tried an older one from your backups (you do keep good backups, right?)?
If I 1) new where this RDF file typically resides and 2) wasn't going through a major migration from Windows -> Ubuntu complete with a totally new machines then I'd normally say yes. But I can't say yes here. I do have an passwdmaker.rdf under ~/.mozilla/firefox/<profiledir>. But that's dated today...
Regarding your pointer to the FAQ: But I haven't lost my MP really, in fact I've never changed it! It's always been the same but now password maker says it's wrong. That's what's strange. That and the fact that although I don't know my MP I can currently still use password maker by and large.
Assuming I eventually need to get my MP known again, two question. Firstly - how do I do that? Blow away password maker? Uninstall the extention? What?
Secondly, would I then have to re-establish each and every password I'm using at all of my web sites???