I was just about to post something about this, I thought it was just MyVMK Launcher being buggy. Looks like all my trouble restarting+reinstalling was pointless. :P
I'm having this same problem! I tried uninstalling and reinstalling launcher, with no luck. I'll try again tonight.[DOUBLEPOST=1473159573][/DOUBLEPOST]
Go > Go to Folder...
Type '/Applications/MyVMK Launcher.app/Contents/Resources/drive_c/users/myvmk/Temp' without quotes
Edit > Select All
File > Move to Trash
Problem solved! I suppose I could add a way for the application to delete the contents of the Temp folder every week or so. I update the application every couple of months, so you should download the latest version anyways.