Hi, a while ago, Daniel Veillard reported a problem with not being able to create new ThreadGroups. I suggested a fix to thread.c which fixed his problem (The fix was setting groups to 0 instead of to a pointer to a zero-length object array.) Now that we made that change, Tim reported that somebody submitted a bug fix that suggests undoing that change. Is there somebody out there for whom that fix doesn't work, and if so, could you report on what the problem is for you and what classes.zip you're using? - Godmar