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It works for me in v.1.61, are you using this one?
in v.1.6, prefilter=3 requires a pre_custom clip which must be supplied. It's the same as prefilter=4 in v.1.61
I might write some error proof code for this in later revisions.
Anyway I recommend using the latest version as it fixes a few important things.
If it's not this or you are using already v.1.61 tell me what is your source input for smdegrain. I work in avisynth 2.58 so I can't give advices if it's a v.2.6 related issue.
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