To me, this sounds a lot like the directional flow of toilets flushing. I'd have to see this as an actual experiment before I can be convinced of what the webopedia page is claiming.

Check out my previous comment on the time a friend and I watch his TV upside down. There was zero difference that I remember.

Consider where most of the monitors are shipped from. Did they send "southern hemisphere" specific televisions and crt monitors? And what happens at the equator?

Could your monitor have been fritzed on the flight? Did it work normally when you brought it back?

This would actually be a fantastic YouTube video, whether it debunks or proves the claim being equally interesting.