Composer keeps switching back to markdown mode

Same here on two browsers.

It's stored per device in local storage, so private windows and cleared storage reset it. If it resets in a normal window, check whether your site has "Force markdown composer" switched on — an admin setting wins over your choice.

It was the admin setting! Our other admin turned it on during the beta. Sorted.

Since 4.2 I picked the rich-text composer, but every time I open a new reply it's back in markdown mode. Is the choice supposed to stick?