No relation with VSFilter compatibility, but here on XinXP SP1, powered by ATI videocard using wxp-w2k-catalyst-8-01-040421a-015419c, on overlay mode 1, YV12 disabled, I can move subtitles using shift+down arrow on the black border under the movie with no problem.
I use the extended desktop option, move the video window on the extended desktop, press F to go to full screen (the black borders are added) and that's it. No need for vsfilter.
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