I've set up a managed miner for cast-xmr and put the pool and wallet address in the pool configuration. But when I start the miner it says no pool is defined. Does it not pick the details up from the pool config for cast-xmr?
Can you right-click your stopped miner and run diagnostics? Post them here, we can help. I use cast-xmr with no issue, but your pool definition may need some tweaking.