Alleluia!
Things are getting better.

The dates are as follows.

May 26th: 1,800 BTC loss for Poloniex because of the Clam crash.
June 6th: Poloniex covers its loss by seizing money from its customers.
June 14th: Poloniex has realized something went wrong, and it starts to reimburse its customers. I have about 10% back, and in an email, Poloniex wrote that "You can expect additional payments in the future."

It's great, great relief, even if I'm still waiting for the remaining 90%.