All of the sudden in Creative Cloud I have two versions of LR --- LR 5 in "Previous Versions" and LR6. When I start LR6, it tells me it needs to upgrade my catalog. Wonderful. If I select that it doesn't seem to do anything at all (a token progress bar appears for about 3 seconds) then LR6 opens with a gloriously empty catalog. If I try to just import the old catalog it does the exact same thing: claims it has to update it, claims it has updated it and then imports nothing.
What am I supposed to do?!
I had to do that twice before it worked, but it did. Thank you