Still puzzling over what could be the problem when my functioning Google Analytics just stopped working on one site but not another, so that on my non-working site when I "view source," I cannot see the GA code.

Is there some way to identify what has changed or what could have changed to make the code disappear in "view source" when it plainly is still in the html header and body files as it was when it was working?

Do I just go through the header and body files line by line in comparison with prior versions using WinMerge? Should I assume something in these files is suddenly broken, or would there be some add-on that interferes? For example, I added the Link Exchange module to my two sites, one of which still shows GA in "view source." Is WinMerge the only possible avenue of investigation? Am I on the right process track?

Notageek