I had this problem 7/18/17, & found the answer here, which fixed it, and now can't remember the answer. I can't find my original question post either.
Malwarebytes stopped running, wouldn't even open, about 3 days ago. It was right after an update from either Firefox or Malwarebytes. I've uninstalled and reinstalled Malwarebytes 3 or 4 times, which hasn't helped, restarting my PC each time, and ran the Windows Troubleshooter for install/uninstaller problems, which said it had corrected a "corrupt registry patch." I did get a notification fade-out message in the upper right corner of the screen had found 2 issues, when it wasn't running supposedly, but clicking on it to investigate wouldn't take me to Malwarebytes to see the problems. I assumed whatever they were had been quarantined.