Load ROM window freezes

[polsvoice]

I'm running v1.5.4 on Linux Mint 17.3 KDE. My backend is OpenGL. My CPU is an AMD quad-core. When I click the Load button, a Load ROM dialog box pops up. It should let me navigate to a ROM file, but it freezes instead. The frame around the window gets drawn, but the inside doesn't, so you can't select a file or do anything. When I try to close the window, I get a message about how the application isn't responding, and it asks if I want to terminate it.

Here are the errors I get when I run it from the command line:

I: GLRenderManager.cpp:166: Running first frame (0)
QSocketNotifier: Can only be used with threads started with QThread
QObject::startTimer: Timers can only be used with threads started with QThread
QObject: Cannot create children for a parent that is in a different thread.
(Parent is QApplication(0x7fff18f03aa0), parent's thread is QThread(0x23b9040), current thread is QThread(0x7f497c001aa0)
QBasicTimer::start: QBasicTimer can only be used with threads started with QThread

The last line is repeated several times, then

QObject::startTimer: Timers can only be used with threads started with QThread

is repeated several times, then

QBasicTimer::start: QBasicTimer can only be used with threads started with QThread

is repeated several times.

Also, when I run it from the command line, the Load ROM window doesn't appear at all. The application just quits after spitting out all those errors.

[unknownbrackets]

I think this was fixed in #11807. If it's still happening in the latest git build, please comment here and we'll reopen.

-[Unknown]