LeaverBuster Bug

I DCed from a ranked game, so I got low priority queue. Whenever the queue was up and I accepted the AFK check, if somebody declined/missed it, my client would bug out, and keep the "match accepted" screen up for a long time. After a while, after I assume I was forced to miss the next one, it would end the queue, causing me to have to waste another 20 minutes. Has anybody else had this happen to them? If so, I hope it's an issue with the new client and not my computer. In addition to my first question, does anybody know how to revert back to the old client?