3GS, 3.0.1 jailbroken, MMS hack.

I used this to enable MMS/Tether...

[ame=http://forums.macrumors.com/showthread.php?t=792894]HOW TO: Install Official MMS on Jailbroken iPhone 3G/3GS (3.0-3.0.1) - Mac Forums[/ame]

My visual voicemail works fine the first time I listen to a voicemail, but it's really tough to get it to play a 2nd time.

Anyone have any idea what might be causing this?