Hi Martin, I'm not sure I understand the full picture. Is this it:

You have window #1 and click a link or button that opens a URL in a new window #2. Window #2 has focus, and window #1 is in the background.

You switch to window #1 without closing window #2. Window #2 is in the background, window #1 has focus.

In window #1 you click a link or button that sends a URL to window #2:

• If it is the same URL as before, then window #2 is not brought into focus
• If it is a different URL, then window #2 is brought into focus

Is that what you see?

[quote]You have window #1 and click a link or button that opens a URL in a new window #2. Window #2 has focus, and window #1 is in the background./quote Window 2 sends Data onklick (Answer on PM Chat), Window 2 goes to background. Window 1 is in focus.

If Window 1 it is the same URL as Windows 2, then window #2 is going to Background
If Window 1 it is a different URL, then window #2 stays in focus

Hmm, okay. When window #2 sends data, sometimes the URL of that window changes to the URL of the original opening window, and in that case, the window goes into the background? I don't understand what is happening there, so I'm not sure how to re-create the problem in a simple way. Is there is a demo site for the Chat product?

Not a demo: https://www.auto-treff.com/chat/ Create a account an write PM to Martin (me) or Florian (he knows the Problem) also tested in safe mode. Thx a lot. regards Martin