Hello - I've had a stable modded build of Skyrim SE (1.6.1130.0) running just fine for months. I use Vortex and I always start the game through Vortex. I don't use profiles in Vortex. I have Steam Cloud disabled.
Yesterday when I ran the game, the very first screen just shows "New", with the "Load" option greyed out. No "Continue" option as per usual, and clicking on the greyed out Load option unsurprisingly does nothing.
My savegames are all present & correct in the usual location (My Documents\My Games\Skyrim Special Edition\Saves). I've not touched the mod state nor done anything in Vortex for ages. There's only one user account on my PC.
The only thing that has changed is that a family member added their Steam account to my Steam installation the day before, so that they could let me family share one of their games on my PC. Since then, I have had the behaviour above. I have logged them out of Steam on my PC and the behaviour is still as above.
Any help greatly appreciated.