Link to a page where the issue can be seen: hidden link
I expected to see: the view template with the latest posts "Einsätze" the post-type was also done with toolset and always worked fine, but now disappeared.
I took a look at this for you and I suspect that it might be a plugin conflict. Were there any updates or recent changes done to the site before you noticed this issue ?
I also recommend temporarily disabling all the non-toolset plugins and trying again.
I have now deactivated one plugin after the other, but still it did not change. Only when I deactivated the plugin
wp responsive photo gallery
the following text was shown on the website (see enclosed screen shot)
So I do not think that it is a plugin conflict with any of the other plugins. However I have updated the Toolset types plugin. Might that be the reason? And if yes, how do I fix this?
I have now updated the plugin and the information is shown again, but all the css I have added is not used. In the view the css is still there, but the view on the page does not take the css into consideration. It displays the content, but not taking into account the css.
Please advise how to fix this?
I logged in and checked this and the css wasn't loading as you mentioned.
What I would try doing is to recreate the view and check again to see if the css is still not loading. Also are there any caching being done on the site as this could also be a reason for the css not loading.