Hey, I purchased my EasyCap from Ebay. This one to be precise:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=120563109007&ssPageName=STRK:MEWNX:ITI'm using Windows 7 so that may be the problem but I have installed the drivers for it. Anyway, I've got it all hooked up to my Wii so I can record MH3:Tri. However there is a black bar on the left of the recording which means that some of the screen is cut off, it is also not vertically aligned properly.
I've tried it using Ulead and AmCap and they both have this issue. Here's a screenshot in AmCap

Anyone else had this issue and solved it? if so please tell me

EDIT: I'm running it in ArcSoft Total Extreme thingy and it works wonderfully