Unreal Engine Issues

Crash when opening a blueprint that implements an interface that has been deleted

Error message for restricted name "CLOCK$" only displays "$"

See image UPB_RestrictedCLOCK$_PathName.png for the incorrect error message. See image UPB_RestrictedCON_PathName.png for an example of how the error message should display the restricted name. ...

UBT crashes when doing an incremental build

There is a consistent crash when incrementally compiling headers containing generated code. The code for launching UHT accesses a property which is null when compiling with the UBT makefile. ...

Action event in the blueprint graph leads to state dirty.

BP state get dirty if the BP graph have action input event. Regression: Yes, it is not reproduced in 4.16.3 This issue is not related to Blueprint Compilation Manager. ...

Audio volume values get reset

Also confirmed in 4.22 Main @ CL 4413632 ...

Compilation manager inhibit construction script to get other actor reference on the level when running construction script right after actor compile.

Construction script execution following blueprint compile gets invalid actor reference if Blueprint compilation manager is enabled. For example, in the attached project, Right after blueprint compi ...

Make Dialogue Context node no longer has the speaker and targets options exposed

The Make struct node for Make Dialogue Context no longer has the "Speaker" and "Targets" pin exposed. ...

Blueprint Editor: BP functions display dropdown instead of checkboxes for uint8 enum parameters

I traced through the callstack and it looks like the problem is as follows:in order for the BP function to compile, its enum parameter must be uint8, because that is the only type supported by BP fu ...

LOD Build Scale set higher than 1 will cause a merged actor to increase to that scale when created

LOD Build Scale set higher than 1 will cause a merged actor to increase to that scale when created. It seems to be using the LOD Build Scale to double in size on actor merge. This is a regression: ...

Scroll bar jumps to the top of the window when changing Output Log 'Categories' checkboxes

When the Categories dropdown is changed in the Output Log, the scroll bar will jump to the top of the page. This does not match the behavior of using the search bar which will keep the scroll bar a ...