You may want to check this:
http://www.blackberryforums.com/viewtopic.php?t=1995
Get Version 3.7.1.115 from Cingular (same location as Cingular 4.0) and install it on your Rogers. It will fix the problem you are reporting, while being more stable than 3.7.1.41
Or if you want, install BlackBerryOS 4.0.0.188 from Vodafone :D