Welcome to the forums, thanks for posting.
The first part, is not a bug. Medals are only awarded at the end of the tournament to whoever is in the top 5(top 10 in some cases). Tournaments run from monday to sunday, you can see how long is left in the tournament by viewing the tower ranking screen.
The second part, are you trying to sabotage more than 1 building? If so, this bug has been reported already. You are only supposed to be able to plunder 1 building per 24 hrs per player defeated.
I hope that answers your queries. Let me know if the error is relating to something different. If so, please edit your first post to follow the required format.
Found here.
Thanks for playing Forge of Empires