Im not sure why this is but if you are rendering a filestream>videotexture>quad and the actual area this renders to crosses over a monitor boundary (with extended desktop for eg in a windowed ex9 renderer) the playback stops or glitches. Other functions (3d etc) seem fine.
I thought this might be a limitation with directx but I dug ot an old dx app i compiled that renders video to texture and it works fine across monitor boundaries.
Is this issue likely to be fixed any time soon? It makes it kindof hard to do any multimonitor (multiprojector) work without span mode (which seems to fix it, but isnt always available)