Playback not working

Toggle switch on back top right of camcorder clockwise to play mode indicator will show CAMERA for Recording, and PLAY for Playback then press play.

You can try first a reset from menu, then , if firmware is available you can reinstall firmware.

Video clip cutting (extracting)
1
Display the video clip from which you wish to extract a segment.
2
Display the NORMAL Mode
Playback Menu (page 37), select
"EDIT VIDEO, and press the
button.

3
Select CUT!! and press the SET
button.
The Cutting Screen appears.

4
Specify the start point of the extract.
Use the procedure below to specify the frame from which the video clip extract will start.
• Play the video clip until approximately the desired point, pause the video clip, then play the video clip one frame at a time, stopping at
start point of the extract. This will be the first frame of the extract.
• If the start point of the video clip is also the start point of the extract, proceed to step 5.

Play:
After pausing playback, press and hold the SET button to the right
about 2 seconds for forward playback, or to the left for reverse playback.
Pause:
During playback, press the SET button.
Accelerated playback:
During playback, toggle the SET button to the left or right to change the playback speed.
Single frame:
After pausing playback, toggle the SET button to the right to move forward one frame, or to the left to move back one frame.
5
Toggle the SET button up.
• The start point of the video clip
extract is set, and the screen
•Specify the end point of the
extract by following the same
procedure as in step 5.
a. Toggle the SET button down.
Each time the SET button
toggled down, the sections
delete and the sections to
save are reversed.
b. Specify the end point of the extract. The frame following
end point of the extract will
the start point of the latter portion to be joined.
6

Press the VIDEO CAMERA button.
A screen appears for you to select either to save the edited video clip as a new (separate) file, or to delete the original video clip and replace it with the edited video clip.
SAVE AS NEW:
The edited video clip will be saved as a new file. The original video clip remains unchanged.
OVERWRITE:
The original video clip will be deleted. Only the edited video clip will be saved.
REVIEW CLIP:
Play back the edited video clip before saving it.
7
Select the desired option, and press the SET button.
• Editing starts.
• When editing ends, you are returned to the NORMAL Mode Playback
Menu.


I think this is what you are after if this isn't what you need you can find the manual at
http://www.retrevo.com/support/Sanyo-VPC-CG9-Camcorders-manual/id/18378dj397/t/2/

If you have the manual for this camera turn to page 15.
This tells you how to switch between Shooting Mode and Playback Mode.
This is achieved simply by pressing the DISP button.
This button is located below and to the left of the FUNC/SET button.
Pressing DISP repeatedly toggles between Shooting Mode and Playback Mode.
I would suggest you try these steps with your Mode Switch in both positions alternately.

Press the Mode button to toggle between the three camera modes. One of them is Playback, marked by a right-pointing triangle. Full details are in the "Playback Mode" section of the manual, beginning on page 30.

Press the Mode button to get to the Video mode, marked by a movie camera. Press the shutter release button to begin recording, press it again to stop. Full details are in the "Video Mode" section of the manual, beginning on page 27.

If you need a manual, you can download one from the manufacturer's web site at
http://www.vivitar.com/files_products/10/ViviCam%20X327%20User%20Manual.pdf

I almost have the same problem.
My camera automatically switches between playback and camera mode quickly only for a while,then it remains still in the playback.When it remains in playback,if I toggle the playback/camera switch few times,it may work for some shots but again the problem begins. (http://www.fixya.com/ThreadAsker.aspx?thid=2918658)
Did you find any solution?

That's because this is a quad. It compresses all 4 video feeds into 1 file. When you play it back, it decompresses the video and shows you each camera. Playback through this unit is the only way to see 1 camera at a time. 
To be able to copy 1 camera shot to a DVD, this is what you need to do: You need to have a TV with Video in and Video out jacks.  Connect the Quad to the TV Video in jack and connect the TV Video out jack to your DVD Video in jack. Playback a single camera shot on the quad to the TV and hit record on your DVD. - The DVD will record whatever is shown on the TV. 

There are no remedial suggestions I am sorry to say. These devices are made in such a way that a 'repair' would not be possible only replacement if under warranty- which this one longer is. 4 years is a good life and technology has moved on now so much that a new camera is going to be the only option.

The lens block appears to be defective. If you need this pl.let us know further.

You can play the images in your camera on a TV or save them to videotape by connecting the camera with the bundled Audio/Video cable. Power up the camera in the PLAYBACK Mode, press the OK/MENU button to open the menu and using the arrow keys toggle up to begin the SLIDESHOW. You can even change the playback format in the MODE MENU. Press the OK/MENU button and using the right arrow key select the MODE MENU. Toggle down to SETUP, toggle right to enter the SETUP MENU and toggle up once to PLAYBACK SETUP. When you toggle right you will be offered four playback options: NORMAL, SLIDE, FADER and ZOOM. When selected you will get the following effects: NORMAL - Each image instantaneously replaces the previous image. SLIDE - The images are sequenced by sliding from right to left. FADER - The images are sequenced via a lap dissolve. ZOOM - The images are sequenced by zooming in to black and zooming out from black.