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Hi, it'd take me forever to redo something like that from scratch i.e. a 'small example'.

I use Visual Studio 2015 / Windows 10.

I fixed the issue, well not exactly a fix, but I simply do an "cv::imshow("drawing", img);" of the Mat immediately after creating the window. The user therefore doesn't have time to minimise it before it's had its first image...

Best,

Jimbo