screen dont turn off after using b.s

[dudubitn]

hello

i have bs player pro 2.40.
xp pro sp3.

something very weird happening:
my computer is setting to shut down auto' the screen after 10-15 minuts in windows power mangement. after im using bs player the screen not shut down auto'.

i need to restart my computer or re-setting power management to make the screen shut down again(when there is no activity).

thanks
david