Checking. What's your address Craig?

The difference is the default difficulty assigned to your miners. Which is about 10 times higher on 3039. This might give the impression that the miner is broken, while in reality it is working fine on a too high diff. Damn I should have spotted this earlier reading your post.

Thanks for bringing this to my attention. Payments just got sent. The reason the delay was the Ethereum Classic Daemon (parity) is only able to maintain a single connection to the ETC network but our payment processor was configured to only process payments if the daemon has at least 3 connections. I've overridden this setting for now to allow payments to go through without delays. I'm sorry for this.

If I knew the account I could even take a look :P

Nobody would know that. Especially with ASLR being used by most current operating systems.

Guido: delone70 is a fellow veteran miner trying to help, he doesn't have to be familiar with Monacoin. I'm currently the only admin around here and I am of course familiar with Monacoin :) 

The issue with Monacoin is the following. The currency used to be extremely popular a couple month ago. Back then our pool had like 10 times the current hashrate and used to find blocks much more frequently. The value of both Monacoin and Vertcoin dramatically dropped at some point and pretty much all pools offering to mine the currency lost most of the hashpower. Mona recently gained back some traction but the overall hashpower is still to low to mine blocks quickly. Since we are a PPLNS pool, we can only issue payments for found blocks and that's why you havent't earned something until now. Our FAQ explains everything in detail: https://coinfoundry.org/faq#payments. You could try to find a Mona PPS pool where would get paid per submitted share. Due to the very high risk for PPS pools to go broke, they usually charge very high fees (> 7%).

Marvin, the pool should work with any ZCash miner, not just the ones listed on the pool page.

No, problem Tomos. And yes that's correct. If a PPLNS pool does not find blocks it has nothing to pay the miners from. An unlikely scenario, especially since the pool's hashrate just increased.

Hmm, I honestly have no idea what could be causing this. Did you try another pool to verify it's something on your end?

Couldn't have explained it any better.