Unable to "Load iCal from URL"

Hi, I'm having trouble creating a new calendar based on an iCal feed.

Here is the feed I'm trying to import:
http://www.site.com/events/feed/

When I go to Jevents -> Calendars -> New
And choose my category... "From URL" and then "Load iCal from URL" - it brings me back to the original 'Calendars' screen and doesn't add anything.

I found another thread / topic on here that suggested adding this line to php.ini:
user_agent="Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)"

But that didn't fix it, either. I turned on Error Reporting = Maximum and that didn't show me any messages, either. I also tried adding the following to php.ini and this isn't helping, either:

memory_limit=100M
upload_max_filesize=100M
max_execution_time=300
post_max_size=100M


Any other ideas?

Thanks!