One thing I've been noticing lately is the Newgrounds medals connection has been behaving extra buggy. There's been quite a few games where, if I let it load then play the game, no medals, but if I reload the page after that and replay, then I can obtain medals.
So really you almost have to let a game load to 100%, then reload the page, *then* actually play the game or the Newgrounds medals connection is just acting way too flaky if you don't. Anyone else noticing this as of late?
Certainly won't help in cases of games where the medals fully are broken, but may help avoid some unnecessary annoying replaying to an extent.
Certainly not as much of an issue in the games which let you resubmit medals, but unfortunately there are plenty of games which don't and many of those where you'd need to clear cache to try again.