digikam 5.1 and 5.2 not starting on WIndows 10

[Eduard Zalar]

Hello again,

I still experience the same problem: I start digiKam 5.2.0 (the new
installer, downloaded today.) - but it hangs up with a stale process in
windows task manager.
Only if I delete the library folder, digiKam starts up with the UI.  It
creates the library folder with the 3 .db files inside.
Now I close digiKam.
I try to restart it - it again hangs up.


I did some additional investigation:

1. There already exists a bug report with a similar description of the
behavior in a comment: 345245 <https://bugs.kde.org/show_bug.cgi?id=345245>
The debug view output described here is basically the same as mine:
5568]
ds\security\umstartup\usermgr\cli\usermgrcli.cxx(165)\usermgrcli.dll!00007FFF4BCA10FF:
(caller: 00007FFF488391AB) ReturnHr[PreRelease](21) tid(22c0) 80070005
Zugriff verweigert
[5568]
base\appmodel\execmodel\modern\lifetimemanager\appxexecutionutil.cpp(40)\modernexecserver.dll!00007FFF4883928C:
(caller: 00007FFF4884DCA5) ReturnHr[PreRelease](76) tid(22c0) 80070005
Zugriff verweigert
[7320] Suspending
"Zugriff verweigert" means "Access denied".
Even if the initial bug report does not report the same behavior, the
comments added later on describe it.

2. A file exists with the same name as the library folder
I observed the folder where the digiKam library should be created.  And
here I recognized that a file is created with the same name as the library
folder should have.  And that file is created before the folder is created
and before the digiKam UI is shown.
Sometimes, I also get the error message at digiKam startup that the folder
can not be created - because there already exists a file with the same
name.  But I can not reproduce this behaviour by now.

If I delete the file, but NOT the library folder, digiKam starts up
normally.
Closing digiKam and restarting it results again in the hang up.

I opened the file and it seems that this is a log file from the SQLite
engine...  I attached it for your reference.

3. There have been several changes in the digikamapp.cpp since V5.0
I am not a C++ nor Qt nor Linux development expert, but I am also a
developer (C# most of the time...).
So I recognize that some lines have been changed/rearranged which may be
important for the start sequence of digiKam.
As I wrote: With V5.0.0 I didn't had these problems.  The problems began
with V5.1.0.


I really hope that all this information helps you to determine the root
cause of this strange hang up.
I would really love to use digiKam!

With best regards
Eddie
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