I've been experiencing it as well, intermittently, for the last couple of weeks. Usually after reloading the page it will work, but as jmascis24 said, it does seem to be more reproduceable with verses at the bottom of the page. It actually appears to be an issue if you're scrolled to the bottom of the page. Today I was trying to highlight in Ether 6. I found that if I highlighted v. 25 while 28-30 were off the bottom of the page it worked, but if I scrolled all the way to the bottom and then highlighted v. 25 I get a react error in the console:
Error: Minified React error #185; visit
https://reactjs.org/docs/error-decoder. ... ariant=185 for the full message or use the non-minified dev environment for full errors and additional helpful warnings.
at Vc (react-dom.production.min.js:230)
at Object.enqueueSetState (react-dom.production.min.js:132)
at ke.O.setState (react.production.min.js:12)
at ke.adjustPosition (SelectionContextMenu.js:156)
at ke.componentDidUpdate (SelectionContextMenu.js:132)
at rc (react-dom.production.min.js:212)
at fl (react-dom.production.min.js:255)
at t.unstable_runWithPriority (scheduler.production.min.js:19)
at Uo (react-dom.production.min.js:122)
at sl (react-dom.production.min.js:248)