When hovering the mouse over an icon and the tooltip comes up, a full screen black window appears, but can be removed by clicking any where. The tooltip appears for a brief moment, but then the black window appears. If clicking the 'X' in the corner, it closes WinSCP entirely.
WinSCP version: Assuming 5.15.3 (no apparent way to check)
OS: Windows 10
Can you send me an email, so I can send you back a debug version of WinSCP to track the problem? Please include link back to this topic in your email. Also note in this topic that you have sent the email. Thanks.