Game installed on Windows XP Pro in C:\Games, BtS 3.13 and FfH 2.025.
Played as Luchuirp. The other dwarven civ founded Runes of Kilmorph which I took offense to

So I razed one of their cities, conquered their capital/holy city and then settled for peace, leaving them one city. Oddly enough, they still liked me after that (I had two +4 relations with them and a measly -3 from 'you declared war on us' so +5 total), which felt totally wrong. I haven't studied diplomacy in too much depth so I'm not sure if this is a bug.
Anyway, on to the real bug. Continued playing, ended up with 4 rivals and everyone has Runes as religion and def pacts with all other civs. Runes is at more than 60% of territory so I'm going for that victory.
Except I can't build Thanes of Kilmorph anymore. Whenever I try, they immediately turn into Paramanders in the queue. I tried this in two cities.
In the first city, I tried to build a Thane but it changed to a Paramander every time. Once, I ordered the Thane and rushed it immediately with gold. Next turn, I had a half-finished Paramander in the queue.
My other city is my production city. That one's capable of building Thanes in a single turn, but not Paramanders. When I order a Thane there, a Paramander pops out in a single turn.
I patched to 25a after finding this thread but the issue wasn't solved in my saved game. I also enabled python pop-ups but got none when the swap happened.
I also used Worldbuilder to swap the Paramanders I made back into Thanes, which worked and they didn't morph back.