i am trying to describe it:
For a short period tere where 50 coin blocks, the wallet was updated then, and the new coin cycle was starting.
the 50 coin cycle was for a short period and before SP2.
Everyone mining at that time got only 50 coins / block.
The List on top of this Thread was made of a missunderstanding i believe, and everyone was mining less coins then predicted ( just as it is described in the source) non one did mine more coins at this period of time.
now instead of 12.5 k or whatever we get 50.000 coins per block. everything goood.
No one lost millions of coins because of that -in fact not even one coin as it was the same ammount for everyone.

You can do a rescan of your wallet to check if everything is okay, but that might take a time.
i did on a spearate wallet, importet my keys, and did a rescan. ammount was the same. so nothing lost, nothing gained.

if you need more information i am prob. the wrong guy, as i only run a p2pool and the blockcrawler.
but for my technical understanding, no one lost coins.