Cannot compose an email (while ZoHo is open in Internet Explorer)

Cannot compose or reply to an email, while in Internet Explorer. It worked as of yesterday, 4 PM Pacific time. Tried to file a support case, but the submit button was missing.

I was able to open ZoHo in Chrome, and can compose/reply there. I was also able to file a support case- but don't know if you received it. I never did receive a confirmation with a case ticket number (like I have in the past).

I've already cleared my cache and did a computer restart- that did not change things.

thanks,

Melissa