I don't believe i have ever used MCE Reset Toolbox. I do use Ceton Diagnostics (using an Infini TV 6 tuner) and I have also been using Guide Tool (but it appears I will no longer need it

The last Rovi outage wreaked all sorts of havoc with my HTPC, and I had to reload WMC several times to get back to where the tuners would work even though I had no guide listing. So it is quite possible that something was broken along the way. Everything now seems to be working perfectly, except I can't tweak WMC with your program. It is a small issue, and I would be perfectly happy if things remained stable as is. (Wish I had jumped years ago).
Anyhow, what is the epg123 Client trying to access when it throws the error. Could it be that I need to change permissions on a folder?
Thx,