This issue just started today. Whenever I try to do motion tracking and click on the "track motion" icon, my cursor turns into the brush tool. I try clicking on the "selection" tool but it remains as the brush although the "selection" tool is highlighted. I tried resetting the work station back to "standard" and that did nothing. I tried closing AE and the problem still remains. I feel like an idiot as there probably is a simple solution to this, but it feels like I have tried everything. I don't know if it matters, but I am using the 5.5 trial.
> click on the "track motion" icon
I don't know what icon you're referring to here. Please post a screenshot showing what you're referring to.
Have you trashed the prefs? Also turn off OpenGL. Sounds like an overlay drawing issue because you possibly changed something in your graphics configuration...