Hi. When you make posts, make sure you give proper tag line so that they can track your work easily and give you proper credits. Blogs can earn you more credits. Even I'm having trouble with credits. Even after posting several pictures on photoblog, and inviting friends, I didn't receive any credits over the friends who signed up through my invitation. When I mailed tripoto on email@example.com, all I earned was 1 credit, after my query. After three photoblogs, I earned 30 credits, and after that, none of my photoblogs were rewarded. It's not just you and me. I hope tripoto will look into it. But anyways, keep posting on tripoto and leave a mail to firstname.lastname@example.org anyways.
Mostly tripoto gives credits points to trips only. For photo blogs they rarely gives any points. I published 2 or 3 photo blogs till now but never got any credit points. And whenever I published trip I got 75 points for every time. So it's better to invest some time in writing than just uploading pictures.