Hi
It reported crash (but Editor still working) when building light try to load some ICUInternationalization DLL, the build light process stopped.
I guess the InverseFast() throw some error message, ICU DLL try to translate that message but fail to find proper dll for my region/language.
I tried to change my Windows8.1 to pure English region/language, but no help.
=== Lightmass crashed: ===
Assertion failed: DllHandle != nullptr [File:D:\Build++UE4+Release-4.18+Compile\Sync\Engine\Source\Runtime\Core\Private\Internationalization\ICUInternationalization.cpp][Line:238]