Update: I found the cause of the issue, finally (thanks Stan).

1) I've created a git repository where I saved "default" preferences created by 
fresh install of NB
2) next, I overwrote those preferences with the backup of my previous 
preferences
3) I compared the commits / made diff on the files and then went step-by-step 
and replaced/reverted the files

Finally I found the single one that caused the problem:

File:
/Library/Application 
Support/NetBeans/15/config/Preferences/org/netbeans/modules/masterfs/ui.properties

This file contains single line:
org.netbeans.io.suspend=1

I have changed the value from 1 to 0 and it works, while keeping all my 
previous preferences! So all my issues were just caused by this single boolean 
value. I don't understand which process and under which circumstances writes 
this value, but definitely the Scan for external changes was heavily affected 
by this, although the UI option seemed to be enabled.

Hope this helps anyone in the future.

Thanks everyone,

Ludvik



> On 7. Sep 2022, at 22:17, Ludvík Michálek <konfere...@bigfoot.cz> wrote:
> 
> Thanks to all of you that responded today (Alexander, Rtherman59), thanks for 
> your tips!
> 
> Finally, the tip below from Stan helped and saved me! 
> 
> I can't believe I forgot such simple thing like removing/moving preferences - 
> the thing I always recommend to others :) This helped perfectly, although I 
> will have to explore how to get most of my previous preferences back, since I 
> really miss them - I've been importing them since v6, year by year..
> 
> THANKS again, you saved my day(s)!
> 
> Have a great day everyone,
> 
> Ludvik
> 
> 
> 
> 
>> On 7. Sep 2022, at 14:30, Giles Winstanley <s...@snaq.net> wrote:
>> 
>> One thing I've noticed over the last few NB releases (on macOS) is that it's 
>> been very haphazard/flaky at reliably working after importing settings from 
>> a previous version. On both NB14/15 I've had to start over with a 
>> fresh/blank preferences folder for it to work reliably (and this even 
>> without any non-standard plugins). Whether this has any bearing on your 
>> situation I don't know, but that would be my first thing to try, and one you 
>> don't mention in your list of things you've already tried.
>> 
>> Simplest thing would be to rename the existing folder 
>> ($HOME/Library/Application Support/NetBeans/15) to something else (e.g. 
>> "15-old") while NB is closed, then reopen. It should essentially start from 
>> scratch; see if that works. If no change then you can revert to the old 
>> settings.
>> 
>> Stan
>> 
>> On 07/09/2022 12:16, Ludvík Michálek wrote:
>>> Hello,
>>> I have issue with NB suddenly stopped seeing external changes to files. I 
>>> am using this feature since NB 6/7 (or so) and it has been working well all 
>>> the time.
>>> Suddenly, it stopped working. I have suspicion that it is related to 
>>> updating the JDK recently.
>>> I am using the feature together with remote-upload feature of project, but 
>>> it does not work even without remote upload.
>>> Before, when I created a file or folder in Finder, NetBeans automatically 
>>> refreshed and showed the changes in the Project/Files tree.
>>> Now I have to run the "Scan for external changes" menu command all the 
>>> time, which completely wastes my workflow, because I use external watchers 
>>> (webpack or gulp) to build the project and then rely on NetBeans to upload 
>>> the changes to remote server.
>>> I have tried almost everything, googled whole day but found no solution, 
>>> nothing helped:
>>> * creating another, clean project
>>> * reinstalling NB, updating from version 14 to 15
>>> * uninstalling and reinstalling JRE
>>> * uninstalling and reinstalling JDK
>>> * checking permissions
>>> * enabling Security>Accessibilty and Security>Full-disk access to
>>>   NetBeans and java processes
>>> * re-enabling "Miscellaneous > Files > Enable auto-scanning of
>>>   sources" option in Options
>>> * restarting NB
>>> * restarting Mac
>>> * .. everything above in different order, several times :(
>>> My configuration:
>>> ================
>>> - JDK version installed: jdk-18.0.2.1.jdk
>>> - JRE version: build 1.8.0_341-b10
>>> - OS: Mac OS 12.5.1 Monterey, Intel x64
>>> Any idea, anyone?
>>> Thanks for help,
>>> Best,
>>> -- 
>>> Ludvík Michálek
>> 
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