[malwarebytes takes up all the resources of my computer]

I bought and installed malwarebytes pro today. Some alarm clock went off in my head when I heard my computer working like a crazy nut, even when I was not working on it and I did not run a scan. So I checked the performance and guess what? Malwarebytes thinks it has to work overtime..... CPU usage of 40% and up to 60% from malwarebytes, remember no scan started. Memory usage out of control, occupied from malwarebytes. Disk traffic out of control too. Remember I have no program running, I'm just watching my resource monitor..... How come malwarebyte acts like that? Is there a way that I can keep the program under control? Could I get a refund? It just slows my system down to a snail.....

Thanks.

Glesu