Can't pulse

Know that this has been up before but please, I can’t pulse there is no error msg

Tried changing ports?

Yes

Is ‘Show no automated popups’ checked or unchecked?

Also, would you be willing to provide more information about your setup? Which version of WhatPulse are you using? Which operating system? (Is it XP, Vista or Windows 7? 32-bit or 64-bit?) And also, describe what’s going on when you’re trying to pulse. Does it just stall, then the green light disappears?