You're right, during the loading of the GCode preview, the GUI hangs. When I made the code for the GCode loading I didn't know about some things inside of Python, which is causing this irritating bug. I've known about it for quite a while already, but I haven't found a way around it without making GCode loading times much worse.
(It's the loading of the file that takes long, not the displaying, the displaying has been improved in RC3 so it is faster and doesn't block the GUI)
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Hallo,
in top of the window, there are some buttons. There you can switch what to display. Press the left one, and ne gcode should be displayed.
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