I believe there's something wrong in C# - when I test my solution (run sample tests button), it passes, but when I try to solve kata (attempt button) I got timeout on first test - FourNodesWithLoopSize3. It finds loop correctly - it enters to if nicely, shows "3" as expected and it doesn't go any further, but for some reason I got timeout. Hardcoding "return 3" inside of the loop returns the same result.

I believe that the last test in C++ is broken. It shows:
Expected: equal to SOS! THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.
Actual: SOS! THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.
and input string clearly starts with SOS.