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Hi,
This is an old problem but it could now become a show stopper if not solved.
When run as an administrator PS runs without a hitch on my system. But I shouldn't have to do that for obvious reasons. If I run it normally (not as an admin, even under an admin account), it misbehaves and strange things are happening :
I went through all the recommendations made on this page : https://helpx.adobe.com/photoshop/kb/basic-troubleshooting.html . Really. To no avail. However, it's worth noting that if I launch PS while pressing the famous Ctrl+Alt+Shift key combo and answer NO to the question about deleting the preference file, everything is working fine. But if I relaunch PS normally, the problems are back.
I have also created a new standard account, a new admin account and tried to run PS under the system admin account. No difference.
Additionally, I also checked the Windows Defender settings, just in case.
Since there's no problem when running PS as administrator, it's obvioulsy a permission problem. No other application on my system needs to be run as an administrator. I have checked all the permissions that have been listed in various articles coming from Adobe. So, obviously again, these documents are not accurate enough. Something is missing in the list of system objects to which full access must be given.
I should also mention that I have a similar problem with Bridge and Lightroom, but let's focus on PS for now.
Please refrain from telling me to re-install everything Adobe (already done) or to point to a possible system misconfiguration. My system is well maintained and works fine with the many applications installed on it and as many of us already know, I'm not alone with these kind of problems lasting since years.
Thanks in advance for any idea.
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Please note that no error message is displayed. I also had a look at the various log files and the only related information that I could find in them are "access denied" notifications that I had already identified. The same "access denied" errors to the file system are also visible when monitoring PS with Process Monitor. But this doesn't tell me what's happening.
Actually, based on my developer's experience, everything happens as if PS (or another sub-process launched by it) was running some parts of its code by impersonating another account not having the necessary permissions (sorry for the programmatic jargon).