I posted this in the bug section previously, then realized it had already been documented. This has been a requested feature, but was rejected in favor of a big fix that never happened. So I'll just throw this out there.
Can we add a cancel option on open duels? If not that, we could have new challenges override open challenges in order to reset it.
I received the error that causes cysid to have an open challenge until it times out after 72 hours. I waited the 72 hours, then received it again within minutes of dueling again.
This, naturally, is making it very difficult to idly satisfy my gambling addiction. I fear it may lead to less wholesome vices, such as YouTube or meth, if I cannot get my fix.