Thread:Project:Support desk/LiquidThreads takes hold of all talk pages but shouldn't

I have installed LiquidThreads 1.2 into MW 1.15.3. I have applied the patches that are explained on the LQT talk page, plus one more fix so Special:Recentchanges doesn't crash, and it works ... too good, kind of.

Symptom: Liquid Threads is active on each and every talk page in my wiki, and the magic word #useliquidthreads is not registered on Special:Version, and it does not work anyway (it's just displayed as is).

What's wrong?