Alright, It makes sense. Thanks for the reply, I really appreciate it. I also wanted to report:
1. A serious bug:
When I run "MS Office Powerpoint 2016" in isolation, it works fine but if I put it in slide show mode (F5) everything freezes so I have to press Ctrl+Alt+Delete, only then I realize Rehips has an alert in the background. It says powerpoint.exe is trying to run wisptis.exe. I have no idea why the alert window doesn't stay on top! ok, after allowing that (with allow only for once option), Powerpoint still remains hanged!
Edit: I have modified the "default.rdb" database before installation (shrinking the list to Windows pre-installed apps only) and added office apps to isolated apps list later. Maybe the default "default.rdb" file Allows the operation and such problem never happens there but still I wonder why the alert window doesn't show itself on top of other windows causing the issue.
Edit-2: I tested this on another computer and everything works fine. Apparently there is a problem with this computer. I'm so sorry, please ignore this till I find out what is going on.
2. A few minor bugs:
A) When running full-screen applications (like a full-screen youtube video in a browser) , the isolation taskbar sometimes stays on top and sometimes it doesn't
and I'm not sure why.
Edit: I think I'm getting the hang of it. With a few clicks on isolation taskbar and isolated app/video, it hides. so probably not an issue here. sorry.
B) In the Allowed section (tab) of Rules Database, I can not change the "ignore file modification" state of any of the programs listed. It always reverts back to "checked" state no matter what! This is actually a cool feature and I think unchecking that option makes Rehips compare sha512 hashes.
BTW, The option works fine with programs listed in the Isolated tab!Edit: OK, it seems it's behavior is dependent on the current protection mode. I'm a bit confused.
C) For some reason On-Screen Keyboard (osk.exe) can not run in isolation! It's a windows accessibility app and might be important for some users.
That said, your software is awesome

ps: Don't you think the forum needs a "known issues" section, with descriptions and links to original posts. Users (like me) could have a quick look at that post before reporting here.