Join Party in progress broken?

[alimdia]

You know what, this might have actually been the issue. I play E only, but if he had all four languages picked and someone in his party was F, G, or J only, that'd do it. (Most likely F since we're an NA data center.)

I can confirm this, this is why people shouldn't pick random languages in duty finder, it creates more problems than it solves. If the instance is hosted as J, D or F and you need to replenish party members DF will not draw people from the E queue, it will wait until someone with the appropriate language queues.