Mouse Scroll Wheel Ineffective in Avast

Using prog version 2014.9.0.2021 in Win7 64bit. I have two Win7 64bit systems running the same Avast versions. Actually this issue has been going on for an older Avast version too.

That is, on one system the mouse scroll wheel does nothing and on the other it scrolls lists like expected. I can’t figure out why the two systems act differently. On the system where the scroll wheel is ineffective I have tried at least two different mice. The mouse wheel works fine in all other applications.

Suggestions on what else to look at or try?

– Larry

Are the mouse drivers up to date…?