So i had same problem witch life monitor on my CWP on both CentOS 6-7.
What i found is. That problem been only on my computer.I was trying all internet browser (chrome,opera,firefox,ie),
But when i login on CWP on my phone or laptom,tablet, everything work right.
What i found is. That problem been in my antivirus (kaspersky) he blocking that live monitor, somehow.
I dont know why...
So i fix that problem by turn kaspersky protection off.
screenshot Login to CWP again and after live monitor load. I turn protection back on.
Sorry for my english... Hopefully i hellp you
:D