Dear MikeMirzayanov,

I am a pretty happy user of the Polygon contest preparation system, but today the invocations decided to not work, while I am trying to get a contest ready for testing. How to fix this? Basically when starting verification, eventually an invocation appears, but it hangs at 0/X tests run. Some other parts of polygon where running a solution is needed do work, such as previewing tests or running validator tests.