Fot atleast a week, they have been sending me emails without links. Often these mails just say "please search" and even don't have the advertiser's links below them... From other sites i'm receiving emails without problems. I opened a trouble ticket on the site, but today it wasn't in the list - so I guess it was deleted!
So are they trying to lose old members by just spamming their email with empty emails?

I think it was just an oversight. I've had really good dealings with the owner of this program. Once, i was accidentally deleted right as I was about to reach payout... of course, I was furious, but as soon as I emailed him about it, he apologized and my account was immediately reinstated with all my funds, and I was paid. I've also done lots of advertising with him. Probably just an accidental oversight.

i am thinking that maybe its a new helper or something

the paid emails finally resumed and last night i hit the payout button and was paid my $5 today

so they are good and really do pay