»e.returnValue = false;« does often raise "... member not found .." for IE's <= 8

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Test case: ​http://jsfiddle.net/hfQeG/4/

[dmethvin]

This is an issue with what the plugin is doing, not jQuery. IE 6/7 (and even IE8 to some extent) don't react well to the event object being cached and used after an event has been delivered. The only way to use it safely is to copy over any properties to a genuine JavaScript object and use that object at post-event time. But again this is not a jQuery issue and also not something we have any control over.