They did have some liquidity problems on Clam when it's price fell, and BTC lenders paid the price (a 12% of their balance was deducted). But it seemed like everything had been solved and they were returning the funds to their users. This action you are talking about is rather quite strange
No, the problem is far from solved.
Lenders only got 10% of what Poloniex seized.
Check the relevant topic:
https://bitcointalk.org/index.php?topic=5151636.0Back to this subject's topic, if you have a transaction ID, it's easy to check. Did you receive the withdrawal confirmation email? What was the IP used? Your IP?