Thank you @danielstockton I updated cljs and that did it.

Does anyone have some good examples of more complex open source om next projects? I'd love to see how others are structuring their reads.

Don't know if this counts as complex, but I've been grokking quite a lot from https://github.com/Jannis/om-next-kanban-demo

yep ! great project

Cool I'll dig through that one. Some of the structure of the om's reader just isn't fully clicking yet.

i've found the untangled-client source to be very helpful: https://github.com/untangled-web/untangled-client/blob/develop/src/untangled/client/impl/om_plumbing.cljc#L12

and here is how they setup the reconciler: https://github.com/untangled-web/untangled-client/blob/develop/src/untangled/client/impl/application.cljc#L200