i open up spiral knights once and it comes up with the bugfix box im happy because i thought this was the bugfix for matchmaking then it said instead of 0% it said multiple instances of this game are running this one will stop and let another complete. so i closed and tried again and tryed again and again and again. it said the same thing. i contacted support and haven't gottena reply yet. any ideas?
Try opening the task manager and making sure there are no extra javaw.exe instances running.