Haven't used LR in quite some time... BIG library problems.

[#1]

Completely changed my gear and was away from LR for about a year or so.

A.  Now, opening it up, there is no longer the library that I once had (although the folders and files are all still on an external hard drive) and the .RW2 files I shot last weekend "cannot be exported". 

B.  If I go to re-import one of folder, the RW2 files are greyed out and only finished .TIFFS are recongnized.

C.  If it matters, I bought and installed DxO Photolab over the Summer, but haven't yet used it.

And ideas about what changed or what I can do?

Thanks, it's driving me crazy.

[#2]

Completely changed my gear and was away from LR for about a year or so.

A.  Now, opening it up, there is no longer the library that I once had (although the folders and files are all still on an external hard drive) and the .RW2 files I shot last weekend "cannot be exported". 

B.  If I go to re-import one of folder, the RW2 files are greyed out and only finished .TIFFS are recongnized.

C.  If it matters, I bought and installed DxO Photolab over the Summer, but haven't yet used it.

And ideas about what changed or what I can do?

Thanks, it's driving me crazy.

[#3]

1. Using your OS file manager, search for LrC catalogs. they would be .lrcat files.

Look at the dates.

Double click on them to launch.

See if you are simply bringing up the wrong catalog.

[#4]

Please post your System Information as Lightroom Classic (LrC) reports it. In LrC click on Help, then System Info, then Copy. Paste that information into a reply. Please present all information from first line down to and including Plug-in Info. Info after Plug-in info can be cut as that is just so much dead space to us non-Techs.