I am starting to get some weird behavior in Photoshop CS6 the past couple weeks.
I purchased my CS6 Design Suite Upgrade through the Adobe Store and it was a Download (vs CD set). Is there anything I can do?
Log in to your Adobe account, then go to My Orders and look for your recent purchase there. There will be a link there to download the install all over again.
Use the Adobe Uninstaller, of course, to remove your current installation.
Perhaps before reinstalling you should try resetting your Photoshop preferences to defaults.
Press and hold Control - Shift - Alt (or Command - Shift - Option) immediately upon cold-starting Photoshop. If you're quick enough it will prompt you to confirm deletion of your current settings.
Reinstalling will NOT reset these settings.