In six years of flying all kinds of CRJs, the EFIS COMP MON message was very common, some places more than others. When you realigned it to runway heading, did you switch to DG mode from MAG mode? That's what we used to do when taking off from, for instance, Rwy 13 at LGA where the mismatch would be particularly awful. We'd realign, switch to DG mode, take off, and switch back to MAG mode somewhere towards 10,000'. God only knows what kind of magnetic anomalies they have in Sverdl...err...Ekaterinburg.