When you do the learning, Blaster.exe should update/create the file C:\Program Files\Team MediaPortal\MediaPortal\myblaster.dat. If it's not doing, do a search in your HD for the myblaster.dat file. It might be misplaced.
AAlso a recompiled blaster.exe in the TVServer instalation package. It will misplace the myblaster.dat and callit serverblaster, but it's the same file. You might try that.