Your old address is still associated with your account, so you should still see the bitcoins. If it doesn't happen automatically, then you'll need SR Support to push it through manually. No, there hasn't been an explanation, but this has been a common issue periodically throughout the last few months - delays both in and out of SR. Everyone always receives their coins, even when it takes longer than it should, and even when SR Support has to push the transactions through manually. Remember, this is not a simple wallet to wallet transfer here - there is also coin tumbling involved, which makes that system more complex and introduces possible delays when it's not functioning correctly. The situation will resolve itself - or at least it usually does. If not, still no need to worry because DPR is aware of the delays and will get things fixed.