Hi Ernest,
thank you for your impressively fast reply.
I tried clearing all caches but the problem persisted.
Then I found the culprit: The generated code for uploads/asp_upload/style.instances-some-two-letter-extensions-here.css contains a backslash where there shouldn’t be one:
... #ajaxsearchprores1_1,#ajaxsearchprores1_2,div.asp_r.asp_r_1{position:absolute;z-index:11000;width:auto;margin:0\} ...
When I delete this backslash, it works as expected again. When changing something in the Theme&Styling search settings and clicking on the “Save this search!” button, this css file is regenerated and the error is back in.
Best,
Stefan