I have managed 15+ years of photos on lightroom and use it mostly for management, not a lot of editing, thus I am on 6.14 as I don't need the latest & greatest.
After a restoring catalog from backup I can open LR and move around, edit photos, etc. After I import it will just die, with no error, nothing.
I'm on 6.14, Windows 10.
What I've done:
Restored from backed-up catalog so I could run LR again
Uninstalled/reinstalled LR (removed preferences to clean that up)
Checked/applied LR updates
Turned off the GPU setting in preferences/performance
Imported photos directly from the PC (not a card)
Used different sets of photos to import to ensure it's not some specific image (but still, should give me an error if that's the case)
Created new catalogs & imported to ensure it's not a corrupt catalog
On import, tried copying images rather than moving them
I feel like I've pinpointed that it's the import as I can do everything else until import on multiple catalogs. I've got multiple Temporary Import Data.db & Temporary Import Data.db-journal files in the Lightroom directory which also point to import as the culprit.