If you’re using Kaspersky Internet Security, there would be an issue to UI of mudfish v5 This would be fixed by disabling “Inject script into web traffic to interact with web pages”. For details please check Debugging issue for Mudfish v5 - Kaspersky Internet Security link.
http://wiki.mudfish.net/Debugging%20issue%20for%20Mudfish%20v5%20-%20Kaspersky%20Internet%20Security
Oh I see. So it’s Kaspersky causing this huh. OK, thank you 