I have the same issue and have not seen a solution.

I can do a remote assistance window, I can see everything, can move mouse pointer & can mouse click.
I can type characters on keyboard OK.

BUT, the position of my view of mouse pointer is about 2 inches to the left and slightly up.
I can tell by how hover buttons highlight or when I click in text area, where the cursor lands.

Needless to say, it renders remote support almost useless.

My PC ------ AVAST free version on x32 Windows Vista
Remote PC – AVAST Premier 2014 on x64 Windows 8.1 (new install)

Steve - Canada