Everytime I've encountered this (including 30 seconds ago) it's been fixable by stopping and restarting the Teamviewer service. I only use Win7, but the process is start > run > TYPE "services.msc" ENTER Then find the TV instance on the right side, right click, stop, right click, start. Fingers crossed it keeps working. Also, typically it's a problem on the PC I'm using, not the remote machine (thankfully!) Good luck all.
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