Throughout the project we often encounter IOBoxes in different places that randomly wouldn’t accept values you type in … it only works if I stop vvvv before that, but I have to be really fast to do so, because F8 also crashes the entire project after a short time since recently (I don’t think this got introduced by a new version, it’s rather something in our patches and we don’t have the time to investigate) … so even the workaround is really cumbersome.
I’ve even seen cases where I was able to edit some slices in a spreaded IOBox, and some slices were showing the same behavior.
edit: running on latest Stable release 2021.3.1