No message at all, Wurm logo keep alone in middle of the screen, doing nothing, until program killed.
Most likely linked to this stable crash report.
Using latest Java 8 64bits and AMD driver.
Exception in thread "JavaFX Application Thread" java.lang.ExceptionInInitializerError
at class.UHu4tvOGG3.iHOS3zg1KL(SourceFile:2398)
...
Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
at class.GrbeI6DEBs.FZOk5L6Gfy(SourceFile:91)
...
Java console content :