rchealy,
Apple support did get back to me today, actually I had to call them as they missed the call time. What they wanted to know is what mouse is working on my MacPro and the version of the hardware. I told them my Wacom Intuous 3 tablet has both a mouse and a pen with programmable buttons and both the mouse and pen will right click when programmed as such.
They also wanted to know what other Mac I tried the mighty mouse on. It works fine and is programmable on a Macbook Air running Lion 7.4
I mentioned a few of the posts I have seen here, especially the one where the upgrade path to 7.5 worked until reverting back to Snow Leopard then upgrading again to Lion 7.5 and now the mouse no longer works.
I also pointed out the it appears to me that the 7.5 version on the App store is either possibly corrupt or missing a file and/or a driver.
The rep indicated to me that they want me to try a clean install, my reponse was what I was seeing on the discussion forum was that the clean install was not working when other people had tried it.
The rep took the information and said she would get back to the engineering dept.
Yesterday she replied to me within a few hours of our initial discussion, so far no response today.
That's it, I wish I had a solution.
I would suggest if you recently purchased Lion and have the mouse issue you would have the same complimentary support and perhaps a flood of phone calls to Apple will let them know they do have an issue.
Dave