VideoStudio :: Creating Transparent Backgrounds For Overlay Track?

I am making a montage of previous logos for a piece of software. As one can guess there will be a lot of pieces I want transparent. The montage will be a moving animation-like video, making it look at though you are moving towards the most recent logo.

I have created .png files of each logo (exporting from CorelDraw 11) making their backgrounds transparent. I then drag and drop the clip on to an overlay track. (I used an instant project and it came with overlay tracks which have an option checked called "Apply filter to Alpha channel," With the "Apply filter to Alpha channel," option checked I set the overlay track to fit the screen and then click the maintain aspect ratio. At this point all the places where the original picture isn't is transparent, but not the background of the picture. I'm making the overlay track size the size of the screen so I can have the logo move across the screen within the picture-in-picture filter which I then add to the overlay track. When I customize the PIP filter I have the logo fade in for the first half second or so in the middle of the screen, then move and tilt to the right or left (I alternate every other logo). At this point I think that the "Apply filter to Alpha channel," is still on, I then create a chroma key with the adjust colour similarity at 100 to make the background of my image transparent (I'm not sure why that part isn't automatic; I'm using two Corel products and I have created an alpha channel in the .png file so that as soon as I put on the timeline it should be transparent, but that doesn't happen, it goes back to the colour I originally made transparent in CorelDraw). Once I have created this chroma key, the space that was originally transparent due to the "Apply filter to Alpha channel" option, goes black. (this area is the spaced enclosed by the extents of the overlay track size and the edge of the .png file). When I right click on the logo in the timeline, there is no option to "Apply filter to Alpha channel" which I guess means you can't have a chroma key and this Alpha filter on at the same time. To remedy the black space I go to the transparency slider and set the value to "1" which gets rid of the black immediately and doesn't seem to make the rest of the image transparent at all (I'm sure technically speaking it does but 1% transparency isn't enough to notice in the .png file).

And now, the problem:There is a white-ish boarder at the edge of the .png picture. and try as i might, I cannot get rid of it. It really ruins the transparent effect. Is there a way to remedy this? or a better way of getting the effect I want which doesn't need to use both the transparency and the chroma key? I've just thought of making a really large .png file with the logo at its center and zooming in quite far in, so there is a white back ground wherever i move the logo and then using a single chroma key to get ride of the background.

[UPDATE]It is the NewBlue PIP that is creating this boarder even when you turn off all boader, shadow and reflection there it is with the boarder of the transparent portions. I also tried rendering this portion to see if it still showed up and its still there even after rendering. Also my idea of making a large picture didn't work, you can't go bigger than 100% when in the PIP editor so the border is still there, closer tot he edges of the screen, but still there none the less.