I have the same problem. Until eM Client get an update out you can run it in Compatibility Mode.
First open Start. Click All apps. Scroll down to eM Client. Drag the icon to your desktop. Right click the icon. Click Properties. Click Compatibility. Click Run this program in compatibility mode. Select Windows 8.
This is a temporary solution, when eM Client issue an upgrade with true compatibility untick the box.
Hope this helps.
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