I need some help scanning. I have an Epson V700 and I'm using VueScan - for years I've been scanning in my medium format negatives, and a few 4x5s, and everything's been great.

I'm now attempting to scan some 5x7 negatives. I have an 8x10 sheet of anti-newton glass from Betterscanning, and have taped the negative to it as one is supposed to. However, on scanning, I'm getting a powerful green slow around the edges of the negative. Thinking this was bleed, I tried making a mask out of a couple sheets of paper running around the outside, but this has had little to no effect. Anyone know what's going on and how to fix it?

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