Hello Matthias,
I can't seem to be able to have the HIDE option taken into account with the following command:
MC.FileSearch.Search SEARCHIN="${sourcepath}" SEARCHFOR="*.*" CONTENT="{$arg(0)}" HIDE AUTOSTART
Yes, The new Search broke some of the scripting with search.
I have not had the time yet to go over all the script commands for the search. But It is on the list to be fix for the coming version