I have never had this problem. One way to find out what the problem is to switch your center channel input to, say your right main speaker, and if the voice track is there then you know that the center channel amp is bad. If there is still no voice track then the Outlaw has lost it's center channel output.
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Epson 3500 3D projector
93" Carl's Place Flexiwhite DIY screen
Outlaw 976 Pre/Pro
Outlaw 7500 for center and surrounds
2- Emotiva XPA-1Ls for LF/RF duty
2- Outlaw LFM-1 EX subs
Oppo BDP-105 Blu-ray/DVD/SACD player
Outlaw LCR (Snell Labs) for center channel duty
Tekton Lore monitors L/R
4- Emotiva ERD-1s surround speakers
Monster HTS3600MKII power center