When the new wallet was released, we all updated our wallets following the instructions posted in this thread. After updating, we got dozens (hundreds?) of POS notifications and a large amount of POS coins deposited in our wallets. The "Balance" value in the wallet reflected our standard POW balance + the new POS coins. This was fine, but some of the more recent POS blocks were not confirming - and no more POS blocks were being generated by the wallet. Looking for a resolution we rebuilt the blockchain - as detailed in this thread - to try and solve this issue. We then found that those POS blocks that were previously credited in our wallets before we rebuilt the blockchain were now completely missing.
In some cases, users have had ~900NRS by POS and they are now absent from the "Balance" in the wallet. Dumping privkey/importing into new wallet yields the same result - no POS blocks from that original influx of POS notifications. The blockchain is rebuilt and the wallets are completely sync'd, but the only POS coins we see are those generated since we rebuilt the blockchain - not before it.
Any idea what is going on here or why it happened? Can confirm the wallets used are the latest from the OP in this thread. Slightly annoying that so much NRS has gone..