first of all thanks for a great program.. just what i needed

my problem is, when i'm watching .avi movies, transcoded with subtitles (.srt) i can't fast forward or otherwise. i'll get a message that says the file is either corrupted or not supported, when do
my Sony bd player is a BDV-E870 home cinema system. so i'm wondering if it is my profil settings that are incorrect.
media device type is set to Sony BDP-S370/S470/S570/S770 (DLNA, 16:9, 720x406) <-- cant i get a greater resolution then that??
and my transcoder is set to TSmuxer, "High priority" (schould it be movies -directshow-tsmuxer insted?)
finally i've checked the transcoding buffer -transcoding without using disc and set the size to 1000MB
schoud my transfer data buffer be greater than 512KB also?
i hope some of you might know the anwser to my problems, looking forward to know so

thanks in forward