Folder disappeared from catalogue after update

[David from the mountains]

I've just had my catalogue upgraded - and a set of developed images on one drive has "dissapeared".

I imported the folder again, and found that a few of the photos have develop adjustments but most don't. Incredibly frustrating, as that is several years of work down the drain.

Anyone got any ideas?

[Califdan2]

Before you do anything else, go back to the catalog which the upgrade saved for you (i.e. where those folders are present).

And try updating it again.  If the same problem occurs DO NOT RE-IMPORT THE PHOTOS as in doing so you will lose work you've done on those photos.  

If the 2nd attempt did not resolve the problem, come back here for turther advice. 

[JohanElzenga]

This sounds like you opened an older catalog that was subsequently upgraded. Upgrading a catalog should not make you lose a folder just like that.