Trouble with yahoo email


New Email
I am currently having two problems (related?) with my email account.

1) I am unable to type anything in the subject bar of an email I am composing, or forwarding. The cursor doesn't even show up there.

2) Also when composing or forwarding email, the cursor doesn't move in conjunction with the mouse. ie: I click on the first line to highlight or edit something and the cursor pops down to somewhere else on the message.

I am currently running Internet Explorer 8, have a Yahoo email account and use Trend Micro Internet Security Pro.