qt5 @5.8.0.0 application crashing

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An aaplication (OBS) using Qt5 is crashing.

Specifically, OBS 19 dies, OBS 18 works.

Application Specific Information:
Crashing on exception: +[NSGraphicsContext graphicsContextWithCGContext:flipped:]: unrecognized selector sent to class 0x7fff742b58f8

Application Specific Backtrace 1:
0   CoreFoundation                      0x00007fff881f625c __exceptionPreprocess + 172
1   libobjc.A.dylib                     0x00007fff87e6ee75 objc_exception_throw + 43
2   CoreFoundation                      0x00007fff881f902d +[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3   CoreFoundation                      0x00007fff88154272 ___forwarding___ + 1010
4   CoreFoundation                      0x00007fff88153df8 _CF_forwarding_prep_0 + 120
5   QtWidgets                           0x000000010ba32193 _ZN23QPixmapDropShadowFilter11qt_metacallEN11QMetaObject4CallEiPPv + 5731
6   QtWidgets                           0x000000010ba435c8 _ZN23QPixmapDropShadowFilter11qt_metacallEN11QMetaObject4CallEiPPv + 76440
7   QtWidgets                           0x000000010b70416d _ZNK12QCommonStyle11drawControlEN6QStyle14ControlElementEPK12QStyleOptionP8QPainterPK7QWidget + 1117
8   QtWidgets                           0x000000010ba3f4e7 _ZN23QPixmapDropShadowFilter11qt_metacallEN11QMetaObject4CallEiPPv + 59831
9   QtWidgets                           0x000000010b737713 _ZN11QProxyStyle11qt_metacallEN11QMetaObject4CallEiPPv + 93139
10  QtWidgets                           0x000000010b86bc35 _ZN11QPushButton10paintEventEP11QPaintEvent + 117
11  QtWidgets                           0x000000010b6c1613 _ZN7QWidget5eventEP6QEvent + 1123
12  QtWidgets                           0x000000010b860430 _ZN15QAbstractButton5eventEP6QEvent + 160
13  QtWidgets                           0x000000010b686e3d _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 301

Full crashlog: ​https://puu.sh/wUNHb/8d00bb1cc3.crash

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crashlog

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How do I edit the text (wrong formatting used for pre-formatted text)

[kencu (Ken)]

Looks like the call that failed is 10.10+, and you're on 10.9....

​https://developer.apple.com/documentation/appkit/nsgraphicscontext/1535380-graphicscontextwithcgcontext

You can try to fix this one call to it's <10.10 equivalent , but you may well find there are more 10.10+ calls if you have found one...