For the last few days each time I try to launch either LR3 or the LR4 Trial version a pop up window appears on my desktop that says:
Lightroom-Opening Catalog: DSC_1234.jpg.lrcat
Then a Windows error message appears stating that Lightroom 64-bit has stopped working. I have uninstalled LR3 and re-installed it and also downloaded LR4 trial version. On both versions the above message still appears. I have tried searching for the file DSC_1234.jpg but I cannot find it.
I have shown the screen capture but, for some reason, the pop-up message does not appear.
Try holding the alt/option key when launching LR. That should prompt it to ask you what catalog you want to open. A tip I learned from watching Jared Platt teaching Lightroom 101 on www.creativelive.com today.