I never said it was a realforce, for me. In fact, I explicitly blamed playing with the teensy.
Also, while 3 is technically "various", and PEBKAC is insulting, I do agree that it is unlikely the fault of the keyboard itself. Nor is it the fault of the user. The fact is, XP is old. Most XP installations are old. Old things, especially old software installations, do really weird things sometimes.
So no, not PEBKAC, but also not the keyboard.