I am not aware of the problem you mention with Blackberry mediaplayer, but you can feel free to try the 1 week trial of the Dollars 5 mediaPlayer to see if it helps you. Feel free to install from the following links:
OTA: http://www.dollars5.com/OTA/mediaPlayer.jad
ZIP: http://www.dollars5.com/downloads/bl...ediaPlayer.zip
COD: http://www.dollars5.com/downloads/bl...ediaPlayer.cod
ALX: http://www.dollars5.com/downloads/bl...ediaPlayer.alx