Issue: Breadcrumbs do not display on wiki pages

The breadcrumb issue should be fixed in the next release. It was a conflict with your customized style; VaultWiki was setting the home-tab-URL to itself when it wasn't actually used as the home-tab, and your style was customized so that breadcrumbs don't appear on the home-tab. Note that if you actually set VaultWiki to be the home-tab, you will have the same problem unless you update your style. But at that point it would be working as intended.

Regarding "activity indications" for your "integration areas", what indicators have you been looking at so far? What have you tried and what was the result? I should note that last-update columns and watched-content notifications don't always behave in an expected way until 4.0.21 (you said you are using 4.0.20).

Since you mentioned you are replacing vBulletin blogs (and the expected method of doing this is to use wiki-feeds), I should also note that daily and weekly feed notifications were broken before 4.0.21. Maybe this is related to the activity indication problem you are having.

I am trying to create integrations that show activity icons just like my current forums or like the wiki articles do in the wiki space.

I think I have no real clue about how all this works. In these screen captures, I show the admin screen for the integration, the forum home view of all the categories and their child forums which shows the integration (but no activity indicator) and the view of the category contents after opening the category where the integrations have disappeared.

I have also tried to use link forums to provide these connections, but those do not really work either except of course as a link. The do not show if the link has new material.

We need the activity indicators for people to know where to look for new material.

Since you have a customized style, it sounds like you need to modify the template vw_area_subforumbit so that it is more consistent with your customized node_forum_level_n template. I think your custom template has added an icon there which the default-style templates don't have.