> OS: windows 10
> PL-SQL: v15.0.3.2059

<PL-SQL Dev> is running, but it is not displayed on the windows task bar.

Sometimes it is displayed when the <PL-SQL Dev>window is moved.

Same symptom occurs on multiple PCs.

Can you start PL/SQL Developer without connecting, go to Help > Support Info and send me the text from the "Info" tab page?

PL/SQL Developer
Version 15.0.3.2059 (32 bit)
31.148239 - 20 user license
Service Contract: None
Style: <None>
Windows 10 (64-bit) Build 17763
ko-KR(1042)/한국어(대한민국)

Physical memory : 8,280,364 kB (3,979,300 available)
Paging file : 25,057,580 kB (18,049,916 available)
Virtual memory : 2,097,024 kB (1,638,232 available)

Parameters
C:\Program Files (x86)\PLSQL Developer 15\plsqldev.exe

Preferences
Session mode: Multi
OCI Library: <none>
Use OCI7: False
Allow Multiple Connections: True

Preference Files
C:\Program Files (x86)\PLSQL Developer 15\Preferences\Default\Default.ini
C:\Users\user\AppData\Roaming\PLSQL Developer 15\Preferences\user\default.ini

License File
C:\ProgramData\PLSQL Developer\aalf.dat

Debug file
C:\Program Files (x86)\PLSQL Developer 15\PlSqlDev.elf

Plug-Ins
*Active Query Builder (1.5.0) (C:\Program Files (x86)\PLSQL Developer 15\PlugIns\ActiveQueryBuilder.dll)
*PL/SQL Documentation (1.4.0) (C:\Program Files (x86)\PLSQL Developer 15\PlugIns\plsqldoc.dll)
(* is Active)

Aliases
DAN01-NET
DEV_OCS
DKBC_DEVDB
DKBC_HISDB2
DKBC_STGDB
...

Homes
OraClient11g_home1 (c:\app\user\product\11.2.0\client_1)

DLLs
c:\app\user\product\11.2.0\client_1\bin\oci.dll

TNS File
c:\app\user\product\11.2.0\client_1\Network\Admin\tnsnames.ora

Using
Home: OraClient11g_home1
DLL: c:\app\user\product\11.2.0\client_1\bin\oci.dll
OCI: version 11.1 (11.2.0.1.0)
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0

Character Sets
Character size: 2 byte(s)
CharSetID: 840
NCharSetID: 2000
Unicode Support: True
NLS_LANG: KOREAN_KOREA.KO16KSC5601
NLS_CHARACTERSET: KO16KSC5601
NLS_NCHAR_CHARACTERSET: AL16UTF16

Process
Working Set = 134,488,064
Memory = 20,947,280
GDI Objects = 677
User Objects = 403
Handles = 653

Monitors
PixelsPerInch = 96

Id = 0
PPI = 96
Primary = True
Handle = 65537
Left = 0
Top = 0
Width = 2560
Height = 1440

Id = 1
PPI = 96
Primary = False
Handle = 65539
Left = 2560
Top = -97
Width = 1080
Height = 1920

Id = 2
PPI = 96
Primary = False
Handle = 65541
Left = -1920
Top = 60
Width = 1920
Height = 1080

MainFormOnTaskbar = True

I (still) have the same issue in the latest 15.0.4 release. Reported this a while back:
https://forums.allroundautomations....mp;Main=16927&Number=64624#Post64624

btw, it seems that in that state Windows also doesn't "know" that PSD is already started, so starts another session etc. Once you click into one of the windows the button usually appears, so maybe this can be solved by setting the cursor in one of the windows?

Can't you solve this problem?

I can't (;-)) maybe Marco can? I thought that maybe this was a conflict with windows 11, but you have this with windows 10, so it's a PL/SQL Developer issue. This issue is mostly annoying at the start of the day, when I start up all my applications in use. I "navigate" to the PL/SQL Developer button which then starts a new instance of PL/SQL Developer so I end up with 2 instances(or 3 etc. if I have not noticed that there are already instances running). I already explained several times why this issue is a problem in several threads. Would be nice if this issue got fixed.