I've been attempting to edit some of my templates so my theme can make use of Font Awesome 5 Pro. To that end, I tried changing the "fa-check-square-o" CSS class for the "Mark as Done" checkbox to "fa-check-square" so it would actually work with the FA5 icons. After doing this, the following error popped up whenever I attempt to doubleclick the "Mark as Done" text to change the resolved status of a thread.
The parameter “objectIDs” is missing or invalid.
I know this may not be so much a "bug" as it is a nitpick, but I just wanted to point it out anyways.