Voice Messages are empty

After an update now all my voice messages are always empty.

I received the email

John Smith,

There is a new voicemail in mailbox 1234:

From:	"+1XXXXXXXX" <+1XXXXXXXX>
Length:	0:00 seconds
Date:	Thursday, March 19, 2015 at 10:29:04 AM

And regardless the length of the real message is always 0:00 seconds

[2015-03-19 10:16:54] VERBOSE[19421] asterisk.c: – Remote UNIX connection
[2015-03-19 10:16:54] VERBOSE[19865][C-00000155] file.c: – <SIP/flowroute-0000016b> Playing ‘vm-intro.alaw’ (language ‘en’)
[2015-03-19 10:16:56] VERBOSE[19868] asterisk.c: – Remote UNIX connection disconnected
[2015-03-19 10:16:59] VERBOSE[19865][C-00000155] file.c: – <SIP/flowroute-0000016b> Playing ‘beep.alaw’ (language ‘en’)
[2015-03-19 10:17:00] VERBOSE[19865][C-00000155] app_voicemail.c: – Recording the message
[2015-03-19 10:17:00] VERBOSE[19865][C-00000155] app.c: – x=0, open writing: /var/spool/asterisk/voicemail/default/1234/tmp/cuKarU format: wav, 0x7fb2ac098108
[2015-03-19 10:17:07] VERBOSE[19865][C-00000155] app.c: – User hung up
[2015-03-19 10:17:07] VERBOSE[19865][C-00000155] config.c: == Parsing ‘/var/spool/asterisk/voicemail/default/1234/INBOX/msg0000.txt’: Found
[2015-03-19 10:17:07] VERBOSE[19865][C-00000155] config.c: == Parsing ‘/var/spool/asterisk/voicemail/default/1234/INBOX/msg0000.txt’: Found
[2015-03-19 10:17:07] VERBOSE[19865][C-00000155] config.c: == Parsing ‘/var/spool/asterisk/voicemail/default/1234/INBOX/msg0000.txt’: Found
[2015-03-19 10:17:07] VERBOSE[19865][C-00000155] app_macro.c: == Spawn extension (macro-vm, s-BUSY, 3) exited non-zero on ‘SIP/flowroute-0000016b’ in macro ‘vm’
[2015-03-19 10:17:07] VERBOSE[19865][C-00000155] app_macro.c: == Spawn extension (macro-exten-vm, s, 23) exited non-zero on ‘SIP/flowroute-0000016b’ in macro ‘exten-vm’
[2015-03-19 10:17:07] VERBOSE[19865][C-00000155] pbx.c: == Spawn extension (ext-local, 1234, 2) exited non-zero on ‘SIP/flowroute-0000016b’
[2015-03-19 10:17:07] VERBOSE[19865][C-00000155] pbx.c: – Executing [h@ext-local:1] Macro(“SIP/flowroute-0000016b”, “hangupcall,”) in new stack
[2015-03-19 10:17:07] VERBOSE[19865][C-00000155] pbx.c: – Executing [s@macro-hangupcall:1] ExecIf(“SIP/flowroute-0000016b”, “0?Set(CDR(recordingfile)=.wav)”) in new stack
[2015-03-19 10:17:07] VERBOSE[19865][C-00000155] pbx.c: – Executing [s@macro-hangupcall:2] GotoIf(“SIP/flowroute-0000016b”, “1?theend”) in new stack
[2015-03-19 10:17:07] VERBOSE[19865][C-00000155] pbx.c: – Goto (macro-hangupcall,s,4)
[2015-03-19 10:17:07] VERBOSE[19865][C-00000155] pbx.c: – Executing [s@macro-hangupcall:4] Hangup(“SIP/flowroute-0000016b”, “”) in new stack
[2015-03-19 10:17:07] VERBOSE[19865][C-00000155] app_macro.c: == Spawn extension (macro-hangupcall, s, 4) exited non-zero on ‘SIP/flowroute-0000016b’ in macro ‘hangupcall’
[2015-03-19 10:17:07] VERBOSE[19865][C-00000155] pbx.c: == Spawn extension (ext-local, h, 1) exited non-zero on ‘SIP/flowroute-0000016b’

Any advice?

I am using Asterisk (Ver. 11.15.0):