Fatal Error with Ajax

I am receiving the following error using the Theme Developer (it's not listed on the Devel page. Is this your module?)

An AJAX HTTP error occurred.
HTTP Result Code: 200
Debugging information follows.
Path: /devel_themer/variables/167204ebac7b9e7795/thmr_1300
StatusText: OK
ResponseText: 
Fatal error:  Allowed memory size of 134217728 bytes exhausted (tried to allocate 44 bytes) in C:\Documents and Settings\Compaq_Administrator\My Documents\Construct_Resources\sites\all\modules\devel_themer\devel_themer.module on line 39

I get the same result with checkbox Display $page array on and off.
All other Devel modules are on.
Is this a memory leak, or do I need to allocate more? If so, how?

Note that the theme popup last line that notifies the user the variables are being loaded, is not clearing between selections of items on the page and so repeats the message again for each selection.