Doesn't look like the upper of your screenshots but the lower one,... 
-> Check the "Vapoursynth Preview" (Filtering lower right corner)
here's a larger view:
When I change the blur to blur12 the blur is larger,...
-> looks fine to me,...
Cu Selur
-> Check the "Vapoursynth Preview" (Filtering lower right corner)
here's a larger view:
When I change the blur to blur12 the blur is larger,...
-> looks fine to me,...
Cu Selur
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Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.
Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.