Hi @mcramblet
Thanks for posting! It looks like you may be receiving an error in your design timeline in Fusion 360.
Timeline errors are shown with red boxes, and you should be able to review the error by right-clicking the icon and selecting "Review Warning." With that said, it seems like you may be experiencing some odd behavior - I noticed I cannot see your design timeline in the video you posted. Do you see it on your end?
It also sounds like the icon may not be shown in red until you select it within the timeline - is this the case? Errors of this type should be shown in red all the time - not just when the individual feature is selected.
If you use the Modify > Compute All tool (shown below), is the error resolved?

As it seems that there is not truly an error occurring with the feature being shown in red, I would also be curious to see if saving the design, closing it, and reopening it resolves this problem behavior.
Hopefully this helps! Please feel free to share a password protected link of the file (be sure to let me know the password!) in a private message to me - I'm happy to have a look!
Paul Clauss
Product Support Specialist
