Yes the latest version 3.4.5, and strangely since I have gotten then latest I have discovered very high CPU 80-90% usage especially "csrss.exe", making my desktop behave like a piece of junk. Horrible.
So I decided to start uninstalling any programs that were in stalled in the last 30 days or so. It just so happened I updated and purchased some new software recently. After the uninstalls one by one and testing the CPU usage each time I finally was at the end of my rope, racking my brain I decided that indeed might be my beloved Malwarebytes update to 3.4.5.. So I decided to turn everything off and guess what CPU went from70-80% to 12 then to 5%. Then I started to turn each feature on one by one the culprit was the ransomware protection.
I duckduck searched this problem and found many users with the same problem, my criteria was "Malwarebytes ransomware protection High CPU usage". One of the solutions was an old download of "Malwarebytes Anti-Exploit". I actually bought that (not sure of the version) 2 or 3 years ago with my subscription and it never worked properly always taking far too long to load and eventually giving an error saying the same so I just uninstalled it and went about my business. The download did the same thing. I guess later it was just incorporated into the main program at no charge. Ransomware protection was working fine until the update (I think), at least I didn't notice this awful problem until recently. The only real issue I have had (on this machine) was the real time web protection.
My machine is info follows:
Operating System: Microsoft Windows 7 Ultimate(6.1.7601 Build 7601)
Physical Memory (Installed): 8 GB
Processor: Intel(R) Core(TM)2 Quad CPU Q9650 @ 3.00GHz
System Type: x64-based PC
Total Installed Updates: 300 Updates - See Detailed View for more information
Display Adapter(s): ATI Radeon HD 4800 Series 8.970.100.1100
CyberLink Mirror Driver 126.96.36.199
System Manufacturer: Intel Corporation
Mainboard Model: DX38BT
Network Adapter(s): Intel(R) 82566DC-2 Gigabit Network Connection 188.8.131.52
ST3000DM001-1ER166 ATA Device 175.31 GB (available) 6.1.7601.19133
ST3000DM001-1ER166 ATA Device 405.50 GB (available) 6.1.7601.19133
ST4000DM004-2CV104 ATA Device 2.81 TB (available) 6.1.7601.19133
ST500DM002-1BD142 ATA Device 166.93 GB (available) 6.1.7601.19133