Lightroom 4 won't launch after I enter the serial number

I was running the Lightroom 4 trial version for Mac (OS 10.7). After my trial was up, I purchased the upgrade (I previously had v.3). Upon launching Lightroom 4, the dialogue asking whether I have a serial number or want to purchase appears. I go through the steps of entering my new serial number (which Lightroom gives a green check) and my v.3 serial number (also a green check), and go through all subsequent steps of the dialogue.
When I hit Finish, the dialogue closes, and Lightroom does not launch. The program isn't even active in my dock. If I launch it again, I get the same dialogue asking if I have a serial number or want to purchase.

I've moved this to the installation forum Drew, where the engineers hang out.
In the meantime, just try deleting Macintosh HD/Library/Application Support/Adobe:Lightroom/Lightroom 4.0 Registration (that's not the user library) and see if that does the trick.

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