Problem solved! Adrien & Colin were correct - the issue was with Windows 
Defender (I am running Windows 10). There must have been a recent update that 
created this problem, not sure.

In any case, I fixed it by opening Windows Security in Settings and then going 
to Controlled Folder Access. I clicked on "Allow an App through Controlled 
Folder Access," found the GnuCash .exe file, and selected it. When I reopened 
the GnuCash app, everything worked normally (no more error messages).

Thanks to everyone who responded!

Sadhna G. True
sadhnat...@hotmail.com
Mobile:  (859) 221-6064

________________________________
From: gnucash-user <gnucash-user-bounces+sadhnatrue=hotmail....@gnucash.org> on 
behalf of Adrien Monteleone <adrien.montele...@lusfiber.net>
Sent: Wednesday, September 25, 2019 4:20 PM
To: Gnucash Users <gnucash-user@gnucash.org>
Subject: Re: [GNC] Unable to modify existing database

My recollection is spotty but that sounds familiar. Maybe related, (or the same 
person) a few weeks ago someone could only save using Win10 to a thumb drive - 
for any app. They settled on continuing to do so and not proceeding down the 
rabbit hole further as far as I know.

If the user has access to their alleged user files, then they aren’t logged in 
as a guest, so that isn’t the problem.
If permissions are all set to ‘allow’ then that is ruled out.

That would leave either some sort of security measure (as you alluded to) or a 
drive space issue. (which supposedly isn’t the problem here either)

I’m not familiar with Win10’s security measures at the moment. Perhaps they 
have some sort of ’trusted apps’ list where GnuCash can be white-listed similar 
to firewall settings.

What is odd is that if this is the issue, why aren’t *many* more people 
reporting problems? (there are certainly plenty of Win10 users here)

Regards,
Adrien

p.s. -a cursory web search turns up some advice linked to Windows Defender 
‘Controlled Folder Access’. The suggestion is to turn this feature off. I 
should think though one could white-list an app instead so it isn’t all or 
nothing, but I don’t have a copy of Win10 to verify that hunch.

> On Sep 25, 2019 w39d268, at 2:51 PM, Colin Law <clan...@gmail.com> wrote:
>
> Wasn't there an issue posted recently about Windows deciding that
> gnucash was a malicious app and not letting it write anything to disk?
>
> Colin

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