OmniGraffle 5.3 hanging on Lion [A: Finder was hanging.]
 

Fresh install of Lion. Downloaded OmniGraffle Pro v5.3. Running the app brings up the license dialog box. No matter which option I pick, the app hangs after selecting one of the options. (spinning beach ball, "this app has stopped responding" in Activity Monitor.

Nevermind. I think the problem was with Finder hanging. I use PathFinder so I didn't originally notice the issue with Finder but I could not empty the trash or launch new Finder windows. Relaunching Finder also failed.

Finally, I rebooted my Mac and the Finder issue went away. When I then tried Omnigraffle again, it worked fine.

Not sure what caused the Finder issue....