Can't put up a page at the moment, but I'll look a little closer at my env. I was using 0.32.1 w/o a problem and merely copied the new yui-ext.js.
As for toJSONString, I'm also using json.js (http://www.json.org/js.html) which adds toJSONString to the prototypes of both Object and Array. Again, not sure why that's all of a sudden an issue, but I'll poke around a bit...
The headers in the grid are built by enumerating attributes in an object literal (new in this version, provided by DomHelper). The json site you pointed me to is extending the Object prototype.
Extending the Object prototype is generally frowned upon because it breaks for ... in statements. Object literals end up with functions and enumerating them requires you to check every entry to see if it's a function. Most of the code I develop assumes people follow this unofficial "standard".
I will include a check in the next maintence release to filter functions but there could be other spots in yui-ext affected by this.
On a side note, to avoid possible conflicts with not only yui-ext but other libraries you might include as well, I would recommend (if it's an option) to remove that function from the Object prototype. The difference between calling, say, JSON.encode(obj) and obj.toJSONString() is minimal. Actually I just counted and it's 2 characters shorter.
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