Was there any fix to this? I am having the same trouble. here's my info page:

Quote
PL/SQL Developer
Version 13.0.6.1911 (64 bit)
01.120068 - Unlimited user license
Service Contract: 2019-07-01
Windows 10 Build 19041

Physical memory : 16,514,264 kB (4,677,700 available)
Paging file : 35,388,632 kB (21,491,696 available)
Virtual memory : 137,438,953,344 kB (137,434,182,804 available)

Parameters
C:\Program Files\PLSQL Developer 13\plsqldev.exe

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

Preference Files
C:\Users\G520844\AppData\Roaming\PLSQL Developer 13\Preferences\default\Default.ini
C:\Users\G520844\AppData\Roaming\PLSQL Developer 13\Preferences\G520844\default.ini

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

Debug file
C:\Users\G520844\AppData\Roaming\PLSQL Developer 13\PlSqlDev.elf

Plug-Ins
*Active Query Builder (C:\Program Files\PLSQL Developer 13\PlugIns\ActiveQueryBuilder.dll)
*PL/SQL Documentation (plsqldoc) (C:\Program Files\PLSQL Developer 13\PlugIns\plsqldoc.dll)
(* is Active)

Aliases
ACTVREC_MGO_D
ACTVREC_MGO_P
APOR_MGO_D
APOR_MGO_P
APOR_MGO_Q
...

Homes
oracle_64_12c (C:\Oracle\product\instantclient_12.1.0.2.0_64\)
OraClient11g_home1 (C:\Oracle\product\11.2.0_64\client_1)

DLLs
C:\Oracle\product\instantclient_12.1.0.2.0_64\oci.dll

TNS File
C:\Oracle\tnsnames\tnsnames.ora

Using
Home: oracle_64_12c
DLL: C:\Oracle\product\instantclient_12.1.0.2.0_64\oci.dll
OCI: version 12.1 (12.1.0.2.0)
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0

Character Sets
Character size: 4 byte(s)
CharSetID: 873
NCharSetID: 2000
Unicode Support: True
NLS_LANG: AMERICAN_AMERICA.WE8MSWIN1252
NLS_NCHAR_CHARACTERSET: AL16UTF16
NLS_CHARACTERSET: AL32UTF8

Process
Working Set = 128,712,704
Memory = 31,614,408
GDI Objects = 1606
User Objects = 567
Handles = 806

Monitor
PixelsPerInch = 96

Id = 0
PPI = 96
Primary = True
Handle = 593095
Left = 0
Top = 0
Width = 3840
Height = 2160

MainFormOnTaskbar = True