Please check you are using shortcode syntax in your page [iCal url], not [iCal:url]. Plugin moved to shortcode usage only several versions back, after maintaining compatibility for a period.
Your the man it looks like the problem was the shortcode as soon as I changed [iCal:url] to [iCal url] my calendars began to show up. I guess I assumed it was right because I copied it off your to use as a demo to test.