master builds, starts but no UI

[Jean-Baptiste Faure]

Hi,

I don't know if it is only me: current master builds without problem, it 
starts but the UI does not show up and it does not crash, it does 
nothing (CPU = 0%). Under gdb I see nothing I am able to interpret.
I am building under Ubuntu 16.04 x86-64

I encounter this problem one or two days, somewhere after the commit 
7a46166beb714a3357f7fb04111ba98f6325065f
I am currently bisecting.

Does somebody confirm ?

Best regards
JBF
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