Enscape dialogue boxes with Sketchup do not allow for Alt Tab to work properly. When I Alt Tab back to Sketchup I see an icon for each Enscape dialogue box open. None of these activate the Sketchup session only the Enscape dialogue box. I must manually minimize whatever window is above sketchup to see it. If I close all Enscape dialogue boxes it works properly. It seems to happen when the dialogue box has focus… If the rendering window has focus it does not seem to occur.
I have been pulling my hair out as I Alt Tab a LOT while working.
Thanks!
(I presume that you already know that while you hold [alt] down you can [tab] multiple times to bring up the relevant program: I use it all the time to flick between things… it’s more annoying when you miss the relevant program and have to [tab] through them all again)
Yes, this is how I am using Alt + Tab (Tab, Tab, Tab, etc).
I see a Sketchup Icon for each Enscape dialogue box open at the time. These only activate the Sketchup window sometimes. When the Enscape dialogue box has focus it only brings up that dialogue box, not the Sketchup window.
I think that it’s only the materials window that does not activate the SU window: I have used this before on a single monitor so that I can change materials over the Enscape window.
(Although the assets window has it’s own thoughts about when it’s visible or not)
For me it is also the settings window(s).. for current previews it happens for both the general and visual settings window.
We’ll investigate @renderwiz , although this may be unavoidable due to technical reasons. You’ll receive a further response as soon as possible. 
Fyi - “Alt Tab Terminator” seems to fix the behavior… Sanity restored.
I am not super happy with the interface and will like try another Alt Tab replacement when I have time.
If anyone has one they recommend, please let me know.
Thanks!