@hiskennyness this sounds like a devtools issue. You can exclude it with :cljs-devtools false

to check

you may have a top level form printing to the console somewhere?

Oh, my. I have prints everywhere. Good chance. BRB.

Well, a script tag in the body loads JS that top-level fills the page. Maybe I should do it in an onload event. Anyway, it is now in the benign category, I will revisit when necessary. Thanks for the input (and figwheel).