After I installed the new OS 4.5 and resent service books my BBSmart email viewer stopped working, I contacted BBSmart customer svce but all I got is that they won't do any upgrades because the new BB OS 4.5 HTML viewer supersedes their program. After several attempts to solve this issue I finally found the solution. In order for BBSmart to work you will need to go to Options on your Email/Message screen choose Email Settings and set Enable HTML Email to No on all of your email accounts. Worked like a charm for my BB 8820.