Ok found a workaround, now it works. Still strange bug though. Sorry I couldn’t provide you with information to that bug I was experiencing some time ago, but it was same symptoms as in posts above and appeared only when using an event dispatcher inside a widgetBP… In this case removing GameState cast solved it for me, but this bug still doesn’t seem very rational to me.
Thanks for your time anyway. Hope I could help a bit with this report. I’ll stay tuned for this issue, hope it can be tracked down somehow for other engine versions to come 
Greetings -Max