According to ''Recent queries'' the stack of queued jobs is growing while some jobs (like query/7500 for example) are running for more than 1 week now.
Topic on Talk:Quarry
Heya! I restarted the runners and that fixed the recent hung ones I think. The ones that have been 'running' are all 'hung' I'm afraid - I'll cleanup all the older queries to say 'kiled' now.