Check it out, hover over the WAMP icon in the taskbar - it sometimes says "server Offline" even if it's disabled even if it's turned on and green.
Think this bug has been in the last few versions of WAMP x64 I've tried and nobody cares enough about it to report it.
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i.imgur.com]
This is the screenshot I took while WAMP is working & active but hover my mouse over the icon.