Recieving error: Fatal error: Class 'panels_renderer_standard' not found in I recently migrated a site from a Drupal 6 install to a fresh Drupal 7 install.

I then installed panels 7.x-3.5.
Initially I had an older version of ctools installed, so I had to upgrade from 7.x-1.4 to ctools 7.x-1.6.

I then enabled panels the panels page is not showing up in "Structure". I checked permissions and all the correct permissions have been added.

I then try to flush my cache, and i get this error:

Fatal error: Class 'panels_renderer_standard' not found in C:\wamp\www\projects\elaw\sites\all\modules\panels\plugins\display_renderers\panels_renderer_editor.class.php on line 8


Here is a picture of the error with a full stack trace:



I can run cron just fine, but trying to clear the cache gives that error.
In the modules page "Panels" is enabled.



Before upgrading ctools, I had saved a files/database copy and then tried removing panels from "modules" and adding Panels 3.4 instead.  I got the same error.
I then restored my files and database and tried it again but with upgrading ctools instead as mentioned above.

There was also this error that briefly flashed up when I was enabling the module from the "modules" page, after the ctools upgrade.



********UPDATE*********

I was able to get the cache to clear by just hitting reload.  But, if after the cache clears I try to clear the cache I get the same error.
Now the "panels" shows up in Management->Structure, but it has a strange error on the top of the page:

Notice: Undefined index: rows in page_manager_panels_dashboard_blocks() (line 1251 of C:\wamp\www\projects\elaw\sites\all\modules\ctools\page_manager\page_manager.module).
Warning: Invalid argument supplied for foreach() in page_manager_panels_dashboard_blocks() (line 1251 of C:\wamp\www\projects\elaw\sites\all\modules\ctools\page_manager\page_manager.module).




Notice how none of the predefined panel pages are showing up?

I hit clear cache a couple more times (with it giving the "class panels_renderer_standard not found bug each time I cleared the cache initially and it clearing after I hit reload),
and now the panels page is showing the Predefined  Panel Pages, (user page, etc):



I tried creating a new panel page and got this bug:



I can't seem to create a new panel page.

****END UPDATE*****

************************S E C O N D   U P D A T E*****************

I had an idea that perhaps it was a contributed module that was causing the error.  I was going to just randomly start disabling contributed modules but I thought I would start with any contributed module that had ANYTHING to do with panels.
I found that disabling "Panels Translation" in the "Internationalization" section fixes the problem.


I'm not sure why this was causing the problem, but after disabling it I no longer get the " Fatal error: Class 'panels_renderer_standard' not found" error.
I am also able to get further in creating new panel pages.
I get all the way up to saving and it gives this error:



I have verified that that table is not in the database....

I am on a very tight deadline and would appreciate anyone's insight.
Thanks very much for any help.

Sincerely,

David
Check your modules/panels/plugins/display_renderers folder and make sure there is a file named panels_renderer_standard.class.php inside, that's where the class is contained that is supposedly missing.

Try completely replacing the panels module code with a fresh download, that is: move the current module folder somewhere else (so you can get it again if you need to) and re-upload the module.

If you're applying any patches, make sure you check them for code that might be deleting, renaming, or disabling the display_renderer_standard class.