I/L Mages have had trouble freezing monsters for the longest time, especially Cold Beam. However, I felt that after the CWKPQ update, even Ice Strike has gotten worse. I was training at Wolf Spiders the night before the update and could freeze every monster in a mob of 6. After the patch, 1-2 Spiders still move after being hit. There's also the problem how you can't mob a new monster in range until you move a bit. I hope serious attempts can be made to fix this. It's an ongoing issue that has persisted for quite some time now.