can't check out/in file in pdm standard.

Hi, suddenly, after using VPN to access vault files, come back to work, and can only see files in vault that I have checked-out, will not let me check anything in or out. Any ideas? All models have drawings, and all drawings have models.

I own this file, yet it doesn't seem to recognize this.

SolidworksSolidworks Pdm enterprise Pdm