Wie es scheint, ist der Fehler beseitigt. Die bisher durch beliebige Suchbegriffe auslösbaren Meldungen tauchen nicht mehr auf.

Ich werde in ein paar Tagen mal wieder in den Errorlog schauen. Ich hoffe, dann steht da immer noch:

Gruß, GKS

An on click mechanism for the slider is not scheduled in the currently used script, so the script would have to be heavily reworked, what - if even possible - probably would take a while. Since there is no general interest in this and it's not directly related to WBCE, there hardly will be any volunteer to do this.

What you can do:
1) contact the original author of the template and ask for commercial (paid)  development
or
2) Search (Google) a slider script by yourself which fits to your needs and try to integrate that in the template, if this does not work, ask again for support.
or
3) accept the slider as it is, afaics most horizontal accordions react on mouseover, not on click, so this is the behavour visitors would expect.

Please keep in mind: not all developers, moderators, administrators are always present around the clock.
And especially if you use a template with which hardly anyone has experience, it can take a little longer until an answer comes.

Thanks.