Graph won't update on CSS change

Previously, the desktop and web apps would update the style of the opened graph automatically upon me saving a change to the custom.css (by compiling Stylus files, in my case). They have stopped doing so. Saved changes to the CSS file would now apply only when I restart the app and/or clear the cache. “Refresh (import changes from local files)” doesn’t work.

This correlates with the installment of 0.4.0, and might be related to another problem I reported about CodeMirrors.