Registered (purchased) Acrobat Pro claims it's a test version that has expired

I have purchased a CS 5.5 Design Premium (about a year ago), which contains Acrobat Pro. After working fine for quite some time, it will suddenly no longer launch, and instead the Application Manager comes up and tells me that my "Test version" has expired. When I enter the (correct!) serial number (I get the green check mark), the Application Manager quits itself, then re-launches itself immediately with the same message. I tried uninstalling Acrobat, then re-installing it again from my installation DVD; but the same thing still happens. Once again, I have PURCHASED this product. It is not a test version; it was installed from the DVD.
This only happens with Acrobat. The other applications work fine. It's seriously infuriating.
Any ideas what's going on?
Thanks.

Look in the Applications folder and make sure there's only one copy of LR4, and it's the application rather than a pkg file (just make sure it's got the proper LR icon)
And then it would be worth updating to 4.2  - update is here: http://www.adobe.com/support/downloads/detail.jsp?ftpID=5487
Download that to your Downloads folder or Desktop.  There have been some installation issues with people putting the installer download directly into the Applications folder.  Once it's finished downloading, you'll have a .pkg file.  Close LR and double click on the pkg file to let the installer run.  Once you've finished, double click on Lightroom in the Applications folder.  Check it says you're opening 4.2. and check that you don't now have 2 LR icons in the dock.

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