Hey,
Been a while since I used Substance Plugin in UE, but it appears to be quite unstable.
I have two occuring issues resulting in null pointer exceptions:
1. Unticking a texture output
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000470
UnrealEditor_SubstanceEditor!SSubstanceEditorPanel::OnToggleOutput() [D:\build\U5M\Sync\LocalBuilds\PluginTemp\HostProject\Plugins\Substance\Source\SubstanceEditor\Private\SSubstanceEditorPanel.cpp:786]
UnrealEditor_SubstanceEditor!TBaseSPMethodDelegateInstance<0,SSubstanceEditorPanel,1,void __cdecl(enum ECheckBoxState),FDefaultDelegateUserPolicy,SubstanceAir::OutputInstance *>::ExecuteIfSafe() [D:\RocketSync\5.6.0-43139311+++UE5+Release-5.6\Working\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:309]
2. Selecting a dropdown
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffffffffffff
UnrealEditor_SubstanceEditor!SListView<TSharedPtr<FString,1> >::ScrollIntoView() [D:\RocketSync\5.6.0-43139311+++UE5+Release-5.6\Working\Engine\Source\Runtime\Slate\Public\Widgets\Views\SListView.h:2144]
If I just convert them to integer sliders it works fine. Also it only seems to occur if the dropdowns are nested (meaning you don't directly control a parameter but another dropdown from in imported sbs, which controls a parameter)
Any idea on what to change in the Substance export or engine settings?