Update on the pool:

The problem: due to a (possible) bug in the wallet, when the pool sends payments to miners it tries to use unconfirmed coins instead of the already confirmed ones, the pool sees it as a failed payment and sends it again, most of the time succesfully. Some time after that, the first payment transaction passes succesfully and that leads to a double payment to the miner, which won't go through because lack of funds unless the wallet remains funded (I spent 800 of my own coins yesterday dealing with it, thinking that having a buffer ammount would mitigate the problem, but it didn't).

The workaround: I have modified the pool code so when a payment transaction fails it won't be sent again, knowning that sooner or later it will get eventually confirmed.

The solution: fixing the bug in the wallet would do it, but not having the sources renders that impossible to me, so it is up to the dev.

I would say that using the pool is mostly safe at this point, but keep in mind that I am using an untested workaround and that miners COULD LOSE all their mined coins if the workaround doesn't do what is expected. So, understand that the pool should be considered as testing and that you mine at your own risk. That said, payments are being processed normally AT THIS MOMENT, but can't assure what will happen in the next hours.

Cheers!