Has anyone experienced their Lightroom to suddenly reject their license? I've been using my copy without a glitch for years, and now the software suddenly asks to give a serial number again. Inserting the original serial number does not let me go forward to use Lightroom. I'm a bit perplexed... The only reason I could guess is that my hard drive is slowly losing its integrity, but I still can't understand why the actual serial number is not accepted at all.