When attempting to perform a partial page reload such as an AJAX zone, using a WebKit based browser, (such as Chrome or Safari) you will see the following error if the section of the DOM to be updated contains Element IDs with colons in them:
SYNTAX ERROR - DOM EXCEPTION 12
Typically, the colons in the IDs are a result of Tapestry dynamically generating an ID for the element, although I'm not suggesting the colon is removed.
The problem seems to be caused by something in Prototype. I couldn't tell you exactly what, although this forum messages gives details of a similar problem encountered by another user:
The latest version of Prototype (1.6.1 RC2) fixes the problem. Although I understand you may not be too keen to use a release candidate version of a library in Tapestry, once Prototype 1.6.1 is released, could this be placed into Tapestry 5.1 ?