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The receiver's out put sections are grouped in pairs. Front left and right in one output, rear left and right in second output, and center channel and sub output on the third. Sounds like a semiconductor or semiconductors have gone bad in the center & sub output.
But if 5 speaker setup have your front left and right speakers on the appropriate side of the television, your center speaker in the middle of the tv, Either mounted on the wall or underneath or on the shelf, try to have the center speaker set back from the front speakers. Subwoofer usually I mount behind the entertainment center. Your rear right and left speakers optimum position is behind you on the left and right.
If its a 7 speaker setup everything is the same except side right and left speakers go in the middle somewhere between the right and left front and rear speakers
I will make a example the the cursors  Speaker *TV LF CT and TV* RF Subwoofer behind tv SL SR LR RR
The rear speakers are meant to be placed at the rear preferrably overhead or at the bottom behind your listening area. Both speakers should be facing the sides. You can place your subwoofer anywhere as its sound is non directional. Don't forget to adjust its volume properly, the rear should not overwhilme the front/center sound. Happy Listening
I had the same problem. Set the reciever on 6 channel stereo. On this setting, you should be getting the same sound out of each speaker. Isolate which speakers aren't getting sound. Now, on your speaker switch (the A/B button), select A. If that doesn't fix it, select B. If that doesn't fix it, try A and B (if you can on your reciever).
Now, when you switch back to pro-logic, make sure your a/b channel switch is in the position that worked in 6 channel stereo. Yamaha recievers have a memory, and when you switch various modes, it makes auto adjustments based on what you had set in the past.
So your saying that you have no rear channel. Some recivers use a single stereo output ic for both sides on the rear speakers. you could have a defect with this IC . Anther thing Im sure you check3ed the obvious ie : the switch is on suround sound? If there is a front to rear fader is it in the middle? Good Luck