Hi
When you change the POI Icon categorie the POI icon change to the default icon (black star on orange background)
Regards
Locus Pro 2.51
HC One S with ICS
Sorry, I can not reproduce (Defy+, Android 2.3.6, not rooted, Locus 2.5.1 Pro).
Tested with different categories and different symbols. POI symbol stayed the right one.