First, there's no difference between the period and the dash. It's personal preference. Now if you want to start bashing personal preference, you're on your own.
Next, Comcast wants everyone to have a box and not use the QAM tuner on their set, so they'll do the best they can to piss you off if you're using QAM. In your case, it seems to be working.
As for posting attachments, I think you might have to have posted a certain number of posts first - not sure of that though. I'm sure someone here will pipe up with that information.
Finally, as a Comcast customer, you'll get no sympathy from me - I'm strictly OTA for free with the best quality picture available.