Again short on time. Do you use the 350MB avi files? Because I think you place the mask outside of the 624x352 of the image. I also think you get at the edge even if you are using a High Definition avi. There is also no need for the LoadPlugin.
You should see a blurred spot on the left top corner, that is the mask that will blur the logo. Also did you change the jpg-pic I uploaded to a bmp? 24x depth? Otherwise you are asking for a bmp, when you only have a jpg and avisynth doesn't recognize it. I think xlogo only works with them, so you have to change that.
Re: unrecognized exception error
Okay so try this one:
AVISource("C:\Users\a\Desktop\eigene MVs\mygirl-astarte.avi")
converttoRGB32 xlogo("C:\Mixed\Supernatural\Season 3\cwlogo2.bmp",68,64,5)
You should see a blurred spot on the left top corner, that is the mask that will blur the logo. Also did you change the jpg-pic I uploaded to a bmp? 24x depth? Otherwise you are asking for a bmp, when you only have a jpg and avisynth doesn't recognize it. I think xlogo only works with them, so you have to change that.