I did some additional testing between our test site that works and the production site that breaks. They're both using the same version of SPServices (0.7.0 min). But what is interesting to note is the difference in the jQuery library that is being loaded:
- On the test site it's using a vendor supplied (a Bamboo webpart) jQuery module - 1.4.2 non-minified
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On the production site it's using the jQuery module 1.6.2 minified