Oh, no!Don't remove the underscore from those files; that might make the problem worse.
The files that define $Ajax might be expecting to use the the $Ajax->zenredirect form of the call. Essentially, the functions_general.php file has been updated to "take over" the zen_redirect function, directing that function call to the one owned by the ajax class if the $Ajax variable is defined or to the 'standard' zen_redirect function otherwise.
Did you have any additional plugins installed when you did the upgrade? Could you list some of the files that define the $Ajax variable?
Note: I might not be able to get back with you before tomorrow morning, but I will get back.
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