adicoto refers to the option "Enable drawing subtitles under image with EVR renderer"
under (rightclick >) Options > Preferences > Subtitles [Subtitle properties].
This - of course - only applies if you're using EVR (
Enhanced Video Renderer)
(default under Vista and Win7).
To make this reply more general in case you're not using EVR and also for the possible benefit of other users, I add some other options concerning subtitles which may be of interest:
(In the same window as the one mentioned above)
Is perhaps the box "Draw subtitles to Overlay surface" selected?
If so, deselect/uncheck it.
(If you have "Draw subtitles to overlay" enabled, subtitles can only be drawn on overlay = on the video picture, and not below.)
In connection with "overlay": what is selected as "Rendering mode" under
(rightclick >) Options > Preferences > Video > [Video rendering]?
Are you using new subtitle engine or old?
(
See the box "Use new subtitle parser/renderer" under (rightclick >) Options > Preferences > Subtitles [Subtitle properties].)
Finally there always still is the "Expand picture to"-option
(rightclick >) Options > Preferences > Video > [Video rendering]
(Option at bottom/right)
See
this post (and the thread it is in) for some clarifications.
P.S.: Always, I do mean always, mention version and build-number of your BS.Player! Also it may very well be relevant to know which OS and videocard you're using.