Cashback/points sites have been notified by eBay that as of next week (MyPoints says on 6/16) they’ll be “temporarily” deactivated as eBay tries out some different things marketing-wise.
How long this freeze-out is going to last isn’t clear.
If you were planning to make a big purchase through eBay and had expected to receive cashback, get your eBay order in by June 15th! The best cashback rates right now are 3% cashback (up to a max of $30 per order) through MrRebates on winning bids or BINs, or 4 points per dollar (2.9%) through MyPoints plus a 200 point bonus ($1.45) if you make two or more eBay purchases before the deadline. See either site for a few restrictions (including eBay motors and charity auctions).