I think i see what the problem may be
if you go to zap2it and into tv listings the default says national grid and you look for syfy on monday the 28th continuum and lost girl show as repeats from original air date of last year but if you go into your regional local guide the show as new, Media center is downloading the national grid instead of the regional guide. this looks to be the whole problem as the zap2it national grid guide does not show items correctly. maybe media center should download the local/regional guide instead of the national Grid
The way to see this reproduced on zap2it is clear your cookies and cache and restart you internet browser, go to zap2it.com then select tv listings and the select date of Monday 1/28/2013 the top of the grid will say
National Grid Eastern Eastern Change My Location View My Calendar
now in the search box look at syfy it show continuum and lost girl as repeats, now enter your zip code of your local TV cable and the do the same date and syfyhdp and now it show your local grid and now the shows will show as new.
For some reason Media Center is not correctly showing the air dates and times that match zap2it. zap2it for my time zone PST show it as new at 8:00pm but on Media center it shows repeat with different air date of last year which matches what zap2it show on the re-air of that same showing at 11:00pm which does show repeat but also an air date of last year.
![Mad :x](./images/smilies/icon_mad.gif)