Is this the only way to report bugs is by starting a topic in the forum?  Anyway I just completed the daily challenge 'More trouble than its worth' by defeating trouble in sandpoint with only Merisiel.  It was a pain but I managed to pull it off and I was not rewarded the gold.  I like that you have to raise gold in this game to keep unlocking content and that makes these daily challenges muy importante!

Actually devs lowered the gold we collect with any challenge, but if you play the challenge you still can get some extra gold.

 

For your missed gold reward, try a new login in the game. If it is still missing, then post your ID so they can check.

 

It could be a temporary issue with server, a lot of players are missing some elements in these days.