Profiles missing captures/clips tab, i cannot see my clips the tab on all profiles are gone...

I have, verbatim, the same issues. Additionally, when attempting to view my own videos on the Activity Feed 90% of my clips stop as if they failed to load. I cannot delete old clips in the Captures tab of my profile, either.

Have you checked under Watch through your profile? There is a Manage Capture tab. Go there. Look for the far left tab where it says On Xbox Live. Try changing that tab to On this Xbox. All the clips should be saved there if not for the first option. It's
kind of like a backup saves for clips.

This is an intentional update.

You can read about it
here.

It states:

• The Captures tab on the Profile screen has been removed

Can you see you clip in the home tab 'recent captures?

I can't see posts on my own profile or anyone else's. Specifically X360 game clips, screenshots or achievements. I can't even access game hubs of X360 games anymore...or see any X360 games on my Compare Games list(or anyone else's). The only place I can
still see my X360 uploads is the Watch tab on my profile, but the clips are not viewable. As soon as I upload backwards compatible content, I can't see any of it on the activity feed, but everyone else can. Did you mean all this is common?