I had a look at the hotzone plug-in and I’ve seen that it isn’t compatible with my implementation of the story-rivers. It looks for a story-river with the class “tc-story-river” and there is none in the multi-column layout.
Maybe I can make it compatible if that doesn’t mean too much refactoring.
What you could do is edit the tiddler $:/plugins/felixhayashi/hotzone/config.js and replace “tc-story-river” with “btc-river-1” - that could work and it could enable the first column to work with the echarts plugin