It seems to be working on my end, though it's definitely possible this is a temporary Runemate bug after today's game update. Can you please try restarting osrs & runemate. Or if that doesn't work, you can try closing both, clearing your osrs game cache & starting both again. Feel free to test using the lite version so you don't get charged while it's buggy.
Been using it for a few hours. All seems to work fine. Lvl 95+ at the moment. 214 fishies an hour avg. Works fine with barrel and spirit flakes.
Currently using on the Ironman account. Super easy to set up and works great with fish barrel. Uses dharpoon special often. Just so happened to get a heron pet while using it. Extra bonus!