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I have a little screenshot program, which has a transparent Panel (using TransparencyKey) at its center.

It works fine but I noticed a strange difference between the compiled version and the one I get when running it from VS with VS Host process activated in the project properties.

With the latter I can click through the Panel. But the Exe doesn't do that and turning off VS Host process activated also shields the background from the mouse.

Why is that so? Is there a (cheap) trick to make it work in the exe as well?

(Running VS Express 2013 on W8.1,64bit, all effects turned off)

Edit: Resolved (?!?)

Changing the transparency key color to (any) predefined color indeed seems to make a difference:

pan_hole.BackColor = Color.Fuchsia;  // .FromArgb(255, 242, 23, 199);
this.TransparencyKey = pan_hole.BackColor;

Red, Green, Yellow or LavenderBlush :-) work as well.

This is crazy. It'll take months for me to believe it..!

TaW
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    Seems like this is related with [aero (metro may have the same bug)](http://stackoverflow.com/questions/4448771/c-sharp-form-transparencykey-working-different-for-different-colors-why) –  Jul 18 '14 at 09:13
  • Yes, indeed there seems to be a relation, although, as it is with bugs, their nature isn't easily understood. See my edit! – TaW Jul 18 '14 at 09:24

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