Don't know exactly what's causing this but maybe the "internal" subtitle from within MP is causing this? In the Movie configuration page there's a tab Subtitles.. is it enabled?
this is just a wild guess cause i've never seen this specific error
__________________ - "Improving the WAF" 
MediaPortal: Multi-seat 1.1.0 RC1 + SVN DevBuild
Skin: StreamedMP | Plugins: Moving Pictures | My Trailers | MP-TVSeries | For The Record
Htpc: Gigabyte GA-MA78GM-S2H | AMD Athlon X2 4850e | Gigabyte GV-R545SC-1GI (ATI HD5450) (details)
Spotlight: My Trailers 2.0.x | Moving Pictures 1.0.x | StreamedMP 1.0.x
|