Lightroom 4 does not show any pictures in folders with >N pictures! In my case, N is about 400. No matter if I try to view exisiting folders, or if I import new pictures. Lightroom tells the right number of pictures in the folder, but reports "no pictures" when trying to view the folder contents. Folders with <N pictures work fine. Catalog has been imported and converted from Lightroom 3.6. I am not able to use Lightroom 4 now. The problem is already known, see http://forums.adobe.com/message/42743... This is very annoying. Please let me know when we can expect a solution. Is there any place where a customer who has bought Lightroom can contact Adobe directly on this subject? Thanks.