In my case, rig manager was connect to my kemper,because i can use it to upload some profile on kemper
did you leave the rig manager open for some time or close the rig manager after a few minutes of waiting for the editor to open?
I ask because for me the editor finally open after a few minutes. I have to open the rig manager and then wait for a few minutes and then finally the editor open. it seem this part of the process is more slow. I hope some update can happen to improve the performance and make the editor to open faster.