I am having a problem importing photos into my regular LR 4 catalog.
In the past when something like this has happened, I seem to recall that it took something simple to fix, like trashing the preference file or repairing disk permissions. I have done those things and optimized the catalog, with no luck.
I know there is nothing wrong with the files because I was able to import them into a new LR4 catalog that was inadvertently created after I trashed the preference file.
By the way, I would like to know why, after I trashed the preference file and restarted LR4, LR 4 created a new LR4 catalog in a different location from my existing LR 4 catalog, as well as incorporated my LR 3 catalog (I still have LR 3 on my computer as well) into this new LR 4 catalog.