To remove Podium from the Mac - use the Mac uninstall that we wrote.
http://www.suplugins.com/help2/mac-uninstall.php
But if you want to remove it manually, it's located here:
acintosh HD\Library\Application Support\SketchUp 2014\SketchUp\Plugins\
Remove these files and folders
SU_Podium_V2.rbs
SU_Podium_V2 folder
SU_Podium_Browser.rbs if it exists
The problem you are experiencing, where you have to resort to Force Quit to quit SketchUp with Podium, is not unique. I'm also needing to use Force Quit often. This started happening with 2013 and has not gone away with 2014 on both Mt. Lion and Maverick.
We are trying to figure this out. Sorry for the pain.