Hi Kyle,
thanks a lot for looking into it. I have the site running since a few days, and I just looked at the CBSubs log file. Interestingly, within one second one error led to 54 log lines. I figured now that the reports are actually very detailed, and I will dig deeper before I take more of your time. It seems actually that the error is triggered by the plugin "rereplacer", which uses XML files for HTML text replacement. I believe it makes reference to one of those files which I created, so I'll review those files first.
Again, thanks a lot for your guidance.