Nostalrius Begins - Quality wow vanilla realm (1.12)

I downloaded the 0.5.6 ZIP version from here and the addon works fine for my Alliance characters. But when I use it on my Horde ones, it gives me an on-screen prompt saying "You don't know that language" every minute or so, and FlagRSP doesn't show any character information.

Does anyone who uses FlagRSP know what's going on here, and how to fix it?

I've been experiencing the same issue with FlagRSP (for the Hordies). Despite my best efforts, I've still found no reasoning why it doesn't work for that faction, let alone a fix for it. Hopefully someone has some better insights, maybe a word with some of the other Horde RPers here on the forums would be more fruitful.

Use Immersion RP. Best.