Unfortunately it looks like something in r75 has temporarily broken arcade submissions. The following games are in the queue but can't be approved because they don't seem to work:
Shadow by @uizex1
12 21 [WIP] by @gmx0
HexTastic by @Zetar
I'm going to have to reject these submissions. However were these submitted using r75 or an earlier version? It might be that old releases don't work.