I have been experiencing the same lockup problem for weeks.
Windows 7 /64 and did not install the December windows updates.
I spent hours and hours trying to figure out the problem I thought for sure it was hardware related and wasted my time cleaning the fans, updating my video drivers, testing and even changing my RAM, using temp and voltage monitors, etc, etc.
3 days ago I thought it might be Malwarebytes because I tried everything else and (no offense) the last major problems I have had was due to your program. (The malformed update last January, the VSS conflict, High CPU usage)
So anyway, I came to the forum a few days ago and saw the problem and I have now gone 3 days without a lockup. Longer than I have gone since about 3 weeks ago. ( I turned off everything).
I think you are doing a disservice to your customers by not doing anything about it. I think it's a lot more than 1% and I feel bad about all the people who may not have figured out it's Malwarebytes causing it. I think you should at least send out a email to all your customers or push out an "update" that rolls everyone back to a previous component update. I only lost hours of my time, I almost wasted money getting another power supply, video card, or RAM.
There is no shame in having a problem only in not being upfront with your customers.
Hope you can deal with this quickly. I must have done over 15 hard resets over the last few weeks and it really bothered me to do so on such an otherwise stable and important computer.
Regards,
Dave