is it possible to disable SEO only for CB?

Because there are linking problems with images...I need to disable SEO for CB, but for the rest I would like to have it enabled. How to do that?

Linking issues with images? It maybe better to fix the problem instead of the symptom. What exactly do you mean by linking issues with images?

At any rate the only way to do what you're wanting is to use a 3rd party SEO extension as they often have exceptions for extensions, specific URLs, etc..

Inside of the profile
http://www.my_site.ch/home/cbprofil/userprofile

gj groupimages are not visible. The link goes to:
<img class="img-responsive streamItemImage" src="../images/comprofiler/plug_cbgroupjive/1/28/tn16_558554e03f66f.jpg">

I have an activity menu
http://www.my_site.ch/home/aktivitaet
There the same is with the gj groupimage is visible. The link goes to:
<img class="img-responsive streamItemImage" src="../images/comprofiler/plug_cbgroupjive/1/28/tn16_558554e03f66f.jpg">

And in some earlier posts you wrote, that's an seo problem.(as much as I understood!)

The URLs should have the live_site and not relative pathing (../). Looks like your issue can happen if you create/edit the group from backend. Edit it from frontend and save it as that should correct its activity entry. Your issue isn't SEO, but a bug with GJs getLogo function. This will be fixed in the GJ rewrite release as I'll be updating its system actions in CB Auto Actions as well to work properly.