"Account is being used elsewhere"

i’m having this problem connecting to servers, and it keeps telling me my account is being used elsewhere, i’ve changed my password a few times, reinstalled gmod, and it keeps happening.

any idea why?

I keep getting this as well.
I’ve reinstalled gmod and steam, neither seem to work. Anyone have a solution for this? Or suggestion?

earlier response was this :
Common problem, try closing steam, then open directory where steam is installed and delete the file clientregistry.blob then start steam again, that should work

trying now — CONFIRMED, this works.