Opera Engineer Question - Frame Element Permission

Setup - Three frames (allows music player to play uninterrupted while navigating to different pages); if the user signs in and they have a different theme other than what is loaded by default it is applied via JavaScript.

The script creates link elements with the desired theme path and then removes the original link elements dynamically.

The script works fine when the user directly executes it however when signing in or out the script is executed via an anonymous onload function. Adding links on the redirect page itself when I manually execute the script it works fine.

So I am thinking that somehow (using the exact same code) that because the user (or me since I'm testing this) is not directly executing the script that it's not working due to some concern that has been discussed amongst the engineers who work on the rendering engines directly.

Some input from a Opera developer would be greatly appreciated. For clarification everything is as standards compliant as it gets, error reporting is as always in my work set to maximum and I am receiving no errors in any consoles from any browsers. Also all the frames and code are coming from the exact same domain (localhost).

Turns out the cache mechanism for the anonymous onload script file was not force updating during authentication however it does not clarify why the presence of a Flash object would make or break. The issue is considered resolved however.