Very strange problem with links

I noticed a very strange thing when doing links in my game.
If I have an event that is just a "clicks on object" event and then open a link that works in all browsers.
But if I have an event with a mouse over object and then click with the exact same action to open a link, that link will get blocked by a popup blocker in firefox and chrome (not explorer)

I have no idea why this is happening? It is only occuring when I actually test on the internet (ie have uploaded to a server) Is this a bug I should report to the bugbox or is this some strange issue that is out of control to us? The action for the events are exactly the same, it is just the conditions to carry out the action that are different and one cause the browser to block it with a popup blocker.

These are the events: https://dl.dropboxusercontent.com/u/...Linksblock.png

Here is also the test directly in your browser (left active works, right not) http://www.varagtp.com/SwfTests/Testv5.html

I have also attached an example mfa (You need to build it in Flash and upload to a server to see the problem. If just testing in runtime or even build and run off the computer you will not get the problem)

both are working from me, here, only that strangely, right take longer to show.