AsteriskNOW 1.5.0 Voicemail file permission issue

Hello,

I have an AsteriskNOW 1.5.0 (non beta) server running and I have encountered a problem with the voicemail features. When a vm is left, I can access it by the web browser and play the message. When the message is left, the permission on the files is as follows:
[root@AsteriskWI INBOX]# ls -al
total 112
drwxrwx— 2 asterisk asterisk 4096 May 5 13:32 .
drwxrwx— 8 asterisk asterisk 4096 May 5 11:26 …
-rw-rw---- 1 asterisk asterisk 260 May 5 13:32 msg0000.txt
-rwxrwx— 1 asterisk asterisk 84844 May 5 13:32 msg0000.wav
-rwxrwx— 1 asterisk asterisk 8640 May 5 13:32 msg0000.WAV

After dialing into voicemail from an extension, and playing the same message, the file permissions change and the ability to play the message in the web interface is lost. The permissions after retriving from a phone extension are as follows:
[root@AsteriskWI INBOX]# ls -al
total 112
drwxrwx— 2 asterisk asterisk 4096 May 5 13:34 .
drwxrwx— 8 asterisk asterisk 4096 May 5 11:26 …
-rw-rw---- 1 asterisk asterisk 260 May 5 13:33 msg0000.txt
-rw------- 1 asterisk asterisk 84844 May 5 13:33 msg0000.wav
-rw------- 1 asterisk asterisk 8640 May 5 13:33 msg0000.WAV

No custom changes have been made to the installation other than adding the extensions. Does anyone have any suggestions to correct this issue?

Thanks.