New window opens behind original window.

Hello

No, there is no intended change regarding this unintended behavior from Creo Parametric 7.0.8.0 to 7.0.9.0.

And what should that be good for?

But well, assuming a new user and/or installation ships with default values ​​that fix the problem, let us consider this behavior to be by design.

And let us exclude any customized application being involved/active of course.

So, some short tests prior any new-user and re-installation action:

1.

Check under Tools >Utilities >Auxiliary Applications whether any customized tool is visible and running. If yes, stop all prior any further tests.

Note: This method is NOT sufficient to stop hidden applications which are assumed to be causing the issue.

Details: CS348803 Troubleshooting: How to include/exclude Auxiliary Applications (Toolkit customization) from running in Creo Parametric 

2.

Please check and set default config setting activate_window_automatically yes

If the setting has now changed, then you will experience some intended difference. But how about the new-window-to-background at your end?

3.

If applicable please check and try

File > Open > select model from File Open dialog

vs

Model in workspace > Actions > Open in Creo

Is there any difference?

4.

If applicable, in case of a drawing, set default config to open a drawing:

open_draw_simp_rep_by_default no

Is there any difference?