Regular save works still, just not save-as, import furniture, and export OBJ are not working. I also can't save a render either. No error, just ignores I click the save button there.

I have plenty of space on my 3 month old PC. It has 2TB of NVMe motherboard SSD storage with 395GB free on drive C: where it's file folders are, and 567GB free on my D: drive.