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Why this code freezes GNOME, flickers MWM but works ok in Windows10

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Dear all,

I don't reach to understand what happens with the following code upon different Window Managers.

I launch two instances of this code.
When uncommenting line:

works ok in Motif Window Manager, GNOME and Win10, but when comment that line and launch the program twice, Win is OK but MWM flickers between both GUIs and in GMOME it is frozen and I have to restart GNOME.

Someone could give me some light in this issue?

Is there any way to know what's occuring at Windows Manager?

Thanks in advance.
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