virtualbox.org

Second screen turns grey in V4.3.16 r95972 when focus is back on the first screen and second screen in Full Screen mode. Windows 7 Ultimate client on OSX 10.9.5. Earlier versions did not have this issue. Assuming this is not the desired behavior.
Anybody else has this? Solutions? Or should I report a bug...

Disable the mini-toolbar. Known issue, they're working on it. Search the forums for details.

Thanks, will try that.