When opening a second instance of GW (IIRC, rarely also when starting GW as a first instance), GW creates a Java language error log window that needs to be closed before one can proceed with using GW (but GW as a whole does not crash entirely). Afterwards working appears to be normal. IOW, there seems to be at least one bug in an initialization or a garbage collection routine. Unfortunaly, I cannot give more precise error details yet. If you wish, I will wait for the next occurrence and try to copy and paste the error log.