I do not have a VAR, because I am part of a team that has been granted Solidworks Connected 2021 and 3dExperience access from Dassault directly for a PR project. So getting help for this is frustratingly difficult.
I am the only known member of the team that has this problem, FYI.
About 7 times out of 10, Solidworks refuses to open because it claims that it is already open on another computer - and the computer name is the same one I am on!
I have tried literally everything I can think of, and I have no idea what could possibly be the cause of this, or how to fix it.