We have had the same experience, on some Linux boxes those native file choosers just lock up or don’t work for no discernible reason. And frankly I don’t think that can be fixed in any way. This is the kind of stuff you agree to put up with if you install Linux on your computer.
So by default our app uses the JUCE file chooser (on Linux), and if an user really wants native choosers, he can enable an option and cross his fingers.
–
Roeland
PS. I’m also quite surprised that by default the ChildProcess mixes the output on stdout and stderr together. It’s almost never possible to do anything reliable with this mix. A lot of programs will not flush stdout or stderr when emitting a newline if not writing to a terminal, so it is quite likely that even some individual lines will contain a mix of data from stdout and stderr.