Not responding when fast forward is used
 

File info:

Type : SDTV Rip
Format : Matroska
Container : mkv
Video : AVC 400 Kbps
Resolution : 625 x 480 Pixels
Framerate : 23.976 fps
Audio : AAC Stereo 48 KHz
Overall bitrate : 451 Kbps
Writing application : MKmerge 2.0.2
Writing library : libebml v0.7.7 + libmatroska v0.8.1

subtitles loaded, when fast forward is used (rightarrow key) bsplayer randomly stops responding with no further reaction
killing a process with windows task manager seems to be the only option
any info i can get about my system, you just name it
thanks in advance

Please note that right arrow key is not the (default) key for FF, so I'll make my reply more generic.

If you're using the default keys and didn't redefine these:
Arrow left/right are default for "Seek backward" respectively "Seek forward"
Default keys for "Fast rewind" resp. "Fast forward" are: [Ctrl]+[F6] resp. [Ctrl]+[F5]
Default keys for "Jump backward" resp. "Jump forward" are [,] resp. [.] (comma resp. dot).

When (using the seeking feature) you want to step through the movie "frame by frame" (in "Paused" status): make sure that "Seek by keyframes (AVI and MKV files)" is unchecked/deselected under (rightclick >) Options > Preferences > General [General settings]
(Also make sure you don't use "overlay" rendering mode, like e.g. "overlay mixer" under Options > Preferences > Video > [Video rendering].)
Note that the seeking feature depends on the possibilities of the decoder/filter used! *)

Concerning the "Jump"-feature: you may set the number of "Seconds to jump" under Options > Preferences > General [General settings]
(in the bottom right corner just above "History items to keep").

*):
To know which filters/codecs are actually used by BS.Player for a specific file:
(with that file loaded) rightlick > Options > Preferences > Filters > Advanced
Make sure to also click on "Source" and on the small [+]-signs in front of the codecs/filters shown.
Doing so will provide further info on (and access to) those codecs/filters).