Hi, sorry to add to an older thread here, but I have the exact same problem.
I've adjusted the regional/language settings on both PCs to make them the exact same, but the problem prevails.
The laptop running the latest Panel Builder (downloaded yesterday) is a Win 8.1 Enterprise 64-bit computer, while the computer running X-Plane 10.45 (updated yesterday) is a Win 7 Home computer. Both are now set on the Netherlands and Dutch language. Mind you, I'm using Vistalizator on the Win 7 machine to force it to English language when I use Multi Crew Experience to fly. I thought that might have something to do with. Or should both PCs be running completely the same Windows versions?
Sorry if I overlooked something obvious. Your help is much appreciated.