FWIW, I've started to encounter system lockups since installing MWB Pro. On two occasions my rig failed to come back up after being idle for awhile (neither sleep nor hibernate is enabled, just screen & HDD turnoff) and today it just froze in the middle of a work session when I clicked on an open VPN window to switch to it. Required a power-off shutdown each time as TaskManager would not come up; could still get mouse movement but no right-click, no response to any keystrokes. I've turned off active protection (the 'Pro' feature that the freeware doesn't have) for now & will monitor for a few days to see if the lockups continue. No other software installs or updates since installing the Pro version a week ago so I'm reasonably certain this problem relates to MWB.
Contacted Support... here's what they suggest:
"Hello and welcome to the Malwarebytes consumer helpdesk. Thank you for choosing Malwarebytes Anti-Malware as your malware security solution.
Please download the MBAMCheck batch file from the link below. Save this it to your desktop, double-click it to run, and then attach the log generated to your next reply. These results will give us some detailed installation parameters for Malwarebytes software. http://downloads.malwarebytes.org/file/mbam_check
Please save using the default Notepad format, DO NOT USE WORD or any other office type of software. DO NOT COPY & PASTE the log, send it as an attachment. Reply to THIS ticket, DO NOT create a new one.
Please download DDS from the link below and save it to your desktop: http://download.bleepingcomputer.com/sUBs/dds.scr
*Disable any security software before running(excluding Malwarebytes) *Steps to disable some common security applications(no need to disable Malwarebytes, it will not cause any issues): http://forums.whatthetech.com/index.php?showtopic=96260
Please double click dds.scr to run the tool. Vista & Windows 7 users: You must right click on the file above and select "Run As Administrator" to run the tool. When done, DDS will create two logs and save them to the desktop DDS.txt Attach.txt
Send both please.
Please save using the default Notepad format, DO NOT USE WORD or any other office type of software. DO NOT COPY & PASTE the log, send it as an attachment. Reply to THIS ticket, DO NOT create a new one
Name of file to be attached into your next reply: dds.txt attach.txt checkresults.txt
Please assure you send all files at the same time.
Please reply only to this ticket, do not create new tickets for the same issue. Support requests which have received no customer response within 7 days will be closed automatically."
Hope this helps, my friend.