Reproduction on clena project.
Create an actor class BP called BP_ActorBP
Create a game instance inherited class called called GI_GameInstanceBP
In BP_ActorBP actor bp create an event begin play and connect it to a print string node compile and save
In GI_GameInstanceBP gameinstance bp do the same but before saving select the grey “Comment” comment and then use the color box and USE THE COLOR PICKER and select the dark red color from the event beginplay node. Ok that color
Select the color again and choose a custom opacity I used 0.5 and copy the color code.
Compiel and save GI_GameinstanceBP
Paste the color code into the BP_ActorBP grey comment box color picker and hit ok then compile and save
Go back to GI_GameInstanceBP and try to PIE. You get the error.
Everytime for me.
Seems to be selecting with the color picker causes that error forcing a restart. As if the color picker box isnt removed from the top of heap/active window && just hidden or something.