1) The problem you are referring too in "language updates issues" is only related to plays in the IDE, not related to anything in the arena (please check full discussion with Magus).
2) I do not know why martin and Jeff are the bottom of the league, but since we updated C++ from C++11 to C++14 some code no longer compile (especially codes of top players who use a lot of barely documented pragmas and such). Maybe this is what hit them (failed compilations are reported as "Timeout" in the game).
3) Regarding your C# code, I do not know. Please check again today as we updated our infrastructure. If you suspect that something is still wrong, please let us know.