I abandoned lightroom 4 when the curves problem was identified.
Yes and yes. If you're upgrading from a LR3 catalog to an LR4.1 catalog, then it'll upgrade without you ever knowing there was an issue. If you go back to your 4.0 catalog, then it'll fix them and make some extra collections for you to double check.
Hello Victoria, Thank you for your reply. I am looking forward to importing my catelog to Lightroom 4.1. This however poses another question. When I open LR4.1 it appears to use the same catelog as my LR3.6.
Thank you in advance for your help.
No problem James.
1. When you upgrade your LR3.6 catalog, it creates a COPY of the catalog and upgrades that (so your 3.6 catalog is not touched) . The upgrade does nick the previews, to save doubling them up.
2. If you want to continue using 3.6, yes, it'll use different catalogs. I would query whether you're creating additional work for yourself though! The LR3 sliders are still available within LR4, if that's your concern.
3. To import your LR3 catalog into LR4, just to go File > Open Catalog and it'll ask to upgrade it.