For some reason last night people just cant put items in furnaces when the plugin is on my server. Any ideas?

Same here, players can only burn wood. Can't put any ores inside until I disable the plugin

Check your stack expand size, this operation

item.info.stackable * numOreSlots

is overflowed if stack size for ore too much. This maybe happens after StackSizeController update. You can replace all "int.MaxValue" in source code of plugin to some normal size, like 900000

Covfefe

Same here, players can only burn wood. Can't put any ores inside until I disable the plugin

bigmak

Check your stack expand size, this operation

item.info.stackable * numOreSlots

is overflowed if stack size for ore too much. This maybe happens after StackSizeController update. You can replace all "int.MaxValue" in source code of plugin to some normal size, like 900000

what will the changed config line look like ? as i dont know how you mean 

I have no idea what any of this means or what to do