If you are in a page (not a block) of a module, the XOOPS core retrieves module configuration variables and places them in the global variable $xoopsModuleConfig in /include/common.php

The configuration variables defined in xoops_version.php are stored in the XOOPS DB when a module is installed. Also, XOOPS creates a link in the administration menu for the module labeled "Preferences" where an admin can manipulate those values.

For your problem, if you turn on PHP debugging in System -> Preferences do any error messages appear on the page using your $xoopsModuleConfig variable?

I have the xmyReviews_admin_spaw switch set to 1(yes) in myReviews preferences.

This is when I add a global $xxopsModuleConfig variable but it should be reading it without it if it's a Xoopsglobal already. Hmm unless those two main.php errors have something to do with it.