I have a strange problem which drives me nuts. I get it whenever I need to run some jQuery or javascipt in the new Universal Theme. A good example is this page:
https://apex.oracle.com/pls/apex/f?p=93000:600
Whenever I click on the calendar symbol it opens and closes immediately. This happens when I click and release the mouse button fast. If I do it slowly, click on it, wait for a second and release the mouse button, it will open as expected. I did the inspection of the javascript in the debug console of firebug and I can see that every action runs twice.
On this page you can debug:
https://apex.oracle.com/pls/apex/f?p=93000:16
pressing any of the buttons.
I did a couple of tests with some colleagues and found out that this happens only on computers with Windows 8.1 running the pages in Firefox or Google Chrome. IE works as expected.
I would ask the participants in this forum to do a test for me if they have Windows 8.1 and one of the mentioned browsers. My tests were from two different laptops I have (both Windows 8.1) and from a virtual machine also on Windows 8.1. I was able to reproduce this behavior on all three computers.
I also did the same test with apex.oracle.com and with my local installation of APEX 5.0. Both are behaving the same.
I can't reproduce this with the applications having the old template like this one:
https://apex.oracle.com/pls/apex/f?p=31517:215
Thanks in advance.

Denes Kubicek