After I upgraded to the lastest version(s), the tracking of all downloads has stopped. I worked in earlier version with the code "onclick="slimstat_track_download(event)" added to the download link.
Now pages, post, members, visitors and all other things seem to be working fine. Just the downloads in the content tab are gone.
PS. I tried to change the code to "onclick="ss_te(event,1)", but also no tracking.