Problems with coursor – after upgrading to Win. 8.1 I cannot use my cursor/touch pad to open emails – I have to use the arrow up and down buttons instead

Hello,

I have updated my Win. 8 to 8.1 couple of days ago and with that, I can no longer use my touch pad/cursor to open my emails. Interestingly enough, I can use in on the Folder levels, meaning I point, click, and I can access my Inbox, Sent, etc. When I want to do the same on the email level (inside the Inbox) I cannot. The first email is highlighted and when I want to scan down, I cannot use my cursor/mouse and choose the email, let's say from couple of days ago, to open - I have to press the arrow down button, get to this email, it will get highlighted and then press enter to open it. Anyone has an ide what went wrong? THANK YOU!