Well it turns out that it WAS Skype!
I did everything you suggested and more, it worked with the TV just fine (so probably I didn't put the cables in properly last time), wiggled the cables, reinstalled drivers again, everything.
Because it worked with the TV I figured the problem lies within the Osprey card, not in the camera or the cables. After Googling Osprey card problems I quickly found people having issue with it and with Skype... Apparently Skype turns automatically the NTSC format to PAL! And it was enough to do just that to fix all the problems....
I feel silly and relieved... And a bit angry at the Skype bug :D Thank you so much Nabil for your help, it's lovely to know that I can turn to you in times of technical trouble like that!!
*sends thousand kisses*
Pammie look up all posts that start with 'Purgatory, help!!!' and you'll have some

material

He is a total sweetheart and I'm sure won't mind
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