Yes, I have the same problem. It was ok a few weeks ago but has been an issue ever since, not sure why...
As fot the payment terms, I'm not sure about your question, but its worth noting that Inner-Active will only pay you once you have reached the minimum payment threshold of 200$...
Edit: I found this within their terms;
Quote: "
4.2. inneractive shall be responsible for all invoicing, billings and collections from Advertisers. The revenues payment will be made to the Publisher by wire transfer in the same currency in which inneractive received its revenues from the Advertisers. In the event a currency other than USD or multiple currencies are involved in the calculation of a payment (or any part thereof), inneractive may, at it sole discretion, convert such payment to a single appropriate currency using foreign exchange currency rates (less 5%) as published by www.oanda.com(or any such website or service which replaces it and which the pay per click industry recognizes as a standard) at the time the payment is calculated by inneractive.
"
The fact they reference the 'Pay Per Click' industry, I'd say thats a pretty safe bet thats how the payment works...