Google Music Manager no longer running

I'm having a problem with Google Music Manager on my Mac Mini and can't seem to find an answer anywhere.

I've had the program installed for a while. Last I checked, it was running fine under Lion and uploading my music in the background. I went to look at it today because I finally got around to using Google Music and noticed some recent music wasn't uploaded. I should say that I upgraded to Mountain Lion over the summer but never noticed if Music Manager worked before/after the install.

I can't find the icon in my menu bar. I went to the system preferences and when I click the Music Manager icon, the screen briefly flashes the settings and then goes to a screen that says Google Play and "Music Manager is not currently running". I can click a button that says "Start Music Manager", but nothing happens after that. I opened Activity Monitor and see it running. If I quit the process and then click the button again, it shows in Activity monitor again. But nothing else changes. The window doesn't change and nothing shows in the menu bar.

I tried (twice) to uninstall and reinstall as per the directions from google. No dice. Anyone else ever experience anything like this? I can install fine on another Mac running Mountain Lion. However, I can't install it under a test account that I create on the original Mac Mini - same problem. I'm thinking there's a file somewhere thats corrupting something but can't find any answers or suggestions.

Here's the instructions I used to do a manual uninstall:
Mac
In the Finder, choose 'Go' > 'Go to Folder'
Type in ~/Library/PreferencePanes and click 'Go'
Locate 'MusicManager.prefPane' and drag it to the Trash
In the Finder, choose 'Go' > 'Applications'
Locate 'Music Manager' and drag it to the Trash
If you'd also like to delete remaining music files associated with Google Play, please follow the instructions below:

In the Finder, choose 'Go' > 'Go to Folder'
Type in ~/Library/Application Support/Google and click Go.
Locate the MusicManager folder and drag it to the Trash.
Choose 'Go' > 'Go to Folder'
Type in ~/Library/Preferences and click Go
Locate the preference file ~/Library/Preferences/com.google.musicmanager.plist and drag it to the Trash

Thanks for the reply. After I double click the Music Manager app after removing the prior one, it doesn't put the headphone icon in my menu bar. It only seems to reinstall the preference pane which, when clicked, takes me back through the "Music Manager is not currently running" process.