On a Win XP VM (Parallels) running IE7 some of my behaviors stopped
being triggered (but others are still working) after installing
Windows Update KB947864 (released a few days ago).

Symptom:

QueryObserver (behavior) has an onclick. I register that behavior on
an anchor via Event.addBehavior "a.queryButton": QueryObserver. But
when clicked, the behavior is not delegated to. Instead (apparently)
the default behavior of the link is executed, which in my Rails log
looks like this:

Apr 16 12:20:50 app1 rails[7056]: ActionController::RoutingError (No
route matches "/://javascript:void(0)" with {:method=>:get}):

So it looks like when the link (which had an empty href in the static
HTML) is clicked, the behavior is not called but instead this link
with the no-op bookmarklet is fetched instead. It's so wierd. I mean,
isn't the default behavior of an anchor w/ a javascript bookmarklet to
_execute_ when clicked?

Are you having odd issues w/ your Lowpro app on IE6/7 on XP/Vista in
the last few days?