Jeff.Bezos, first move your thread to here : https://bitcointalk.org/index.php?board=98.0 (look for move button).

I also use Malwarebytes Premium, but so far I have not had such problems with any Electrum server. It is possible that someone has reported that server to MB, and now it is on their list of riskware sites/programs.

You should just change server manually and see what will happen then. I post how to do it here.

Regarding signature verify, it is something you should done before you install Electrum. In this way you can verify that downloaded files are genuine,and not fake. Read about that here.