Thanks, Omar, for pointing me to your other thread and for the sanity check...glad to learn I am not the only one experiencing this issue!
I followed the instructions you gave in the thread, but when I launch Developer, a message appears stating to check the Developer log files (there is nothing in the servoy_log.txt file...I don't think it gets far enough along to create entries for this log). Below is an excerpt from the Developer log file. Would you mind having a look to see if anything unusual stands out. There are a lot of Unresolved requirement: issues, and I have no idea how to resolve them. Thanks!
eclipse.buildId=unknown
java.version=1.8.0_121
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Framework arguments: -vm C:/openjdk-11.0.2/jdk-11.0.2/bin/server/jvm.dll
Command-line arguments: -os win32 -ws win32 -arch x86_64 -vm C:/openjdk-11.0.2/jdk-11.0.2/bin/server/jvm.dll
This is a continuation of log file C:\Servoy_2021_12\developer\configuration\1644004127675.bak_1.log
Created Time: 2022-02-04 11:48:57.089
!ENTRY org.eclipse.dltk.logconsole.ui 2 0 2022-02-04 11:48:57.089
!MESSAGE Could not resolve module: org.eclipse.dltk.logconsole.ui [150]
Unresolved requirement: Require-Bundle: org.eclipse.dltk.logconsole
-> Bundle-SymbolicName: org.eclipse.dltk.logconsole; bundle-version="5.1.1.202110110926"; singleton:="true"
org.eclipse.dltk.logconsole [149]
Unresolved requirement: Require-Bundle: org.eclipse.core.runtime
-> Bundle-SymbolicName: org.eclipse.core.runtime; bundle-version="3.23.0.v20210730-2035"; singleton:="true"
org.eclipse.core.runtime [126]
Unresolved requirement: Require-Capability: osgi.ee; filter:="(&(osgi.ee=JavaSE)(version=11))"
Unresolved requirement: Require-Bundle: org.eclipse.equinox.app; bundle-version="1.3.0"; visibility:="reexport"
-> Bundle-SymbolicName: org.eclipse.equinox.app; bundle-version="1.6.0.v20210723-1130"; singleton:="true"
org.eclipse.equinox.app [198]
Unresolved requirement: Require-Bundle: org.eclipse.equinox.registry; bundle-version="[3.4.0,4.0.0)"
-> Bundle-SymbolicName: org.eclipse.equinox.registry; bundle-version="3.11.0.v20210723-1953"; singleton:="true"
org.eclipse.equinox.registry [241]
Unresolved requirement: Require-Bundle: org.eclipse.equinox.common; bundle-version="[3.14.0,4.0.0)"
-> Bundle-SymbolicName: org.eclipse.equinox.common; bundle-version="3.15.0.v20210518-0604"; singleton:="true"
org.eclipse.equinox.common [200]
Unresolved requirement: Require-Capability: osgi.ee; filter:="(&(osgi.ee=JavaSE)(version=11))"
Unresolved requirement: Import-Package: org.eclipse.core.runtime.jobs; resolution:="optional"
-> Export-Package: org.eclipse.core.runtime.jobs; bundle-symbolic-name="org.eclipse.core.jobs"; bundle-version="3.12.0.v20210723-1034"; version="0.0.0"
org.eclipse.core.jobs [121]
Unresolved requirement: Require-Bundle: org.eclipse.equinox.common; bundle-version="[3.8.0,4.0.0)"
-> Bundle-SymbolicName: org.eclipse.equinox.common; bundle-version="3.15.0.v20210518-0604"; singleton:="true"
Unresolved requirement: Require-Bundle: org.eclipse.equinox.common; bundle-version="[3.14.0,4.0.0)"; visibility:="reexport"
-> Bundle-SymbolicName: org.eclipse.equinox.common; bundle-version="3.15.0.v20210518-0604"; singleton:="true"
Unresolved requirement: Require-Bundle: org.eclipse.equinox.preferences; bundle-version="[3.7.0,4.0.0)"; visibility:="reexport"
-> Bundle-SymbolicName: org.eclipse.equinox.preferences; bundle-version="3.9.0.v20210726-0943"; singleton:="true"
org.eclipse.equinox.preferences [240]
Unresolved requirement: Require-Bundle: org.eclipse.equinox.common; bundle-version="[3.2.0,4.0.0)"
-> Bundle-SymbolicName: org.eclipse.equinox.common; bundle-version="3.15.0.v20210518-0604"; singleton:="true"
Unresolved requirement: Require-Bundle: org.eclipse.equinox.registry; bundle-version="[3.10.0,4.0.0)"; visibility:="reexport"
-> Bundle-SymbolicName: org.eclipse.equinox.registry; bundle-version="3.11.0.v20210723-1953"; singleton:="true"
Unresolved requirement: Require-Bundle: org.eclipse.core.contenttype; bundle-version="[3.7.0,4.0.0)"; visibility:="reexport"
-> Bundle-SymbolicName: org.eclipse.core.contenttype; bundle-version="3.8.0.v20210621-0954"; singleton:="true"
org.eclipse.core.contenttype [111]
Unresolved requirement: Require-Bundle: org.eclipse.equinox.preferences; bundle-version="[3.2.0,4.0.0)"
-> Bundle-SymbolicName: org.eclipse.equinox.preferences; bundle-version="3.9.0.v20210726-0943"; singleton:="true"
Unresolved requirement: Require-Bundle: org.eclipse.core.jobs; bundle-version="[3.10.0,4.0.0)"; visibility:="reexport"
-> Bundle-SymbolicName: org.eclipse.core.jobs; bundle-version="3.12.0.v20210723-1034"; singleton:="true"
!MESSAGE Could not resolve module: org.eclipse.e4.emf.xpath [162]
!MESSAGE Could not resolve module: org.eclipse.equinox.simpleconfigurator [2]
!MESSAGE Could not resolve module: org.eclipse.ui.genericeditor [315]
!MESSAGE Could not resolve module: org.eclipse.wst.common.modulecore [341]
!MESSAGE Could not resolve module: com.servoy.eclipse.ui [30]
!MESSAGE Could not resolve module: org.eclipse.wst.sse.core [352]
!MESSAGE Could not resolve module: org.eclipse.equinox.p2.operations [225]
!MESSAGE Could not resolve module: org.eclipse.e4.ui.dialogs [168]
!MESSAGE Could not resolve module: org.eclipse.ui.views [326]
!MESSAGE Could not resolve module: org.eclipse.core.filesystem.win32.x86_64 [120]
!MESSAGE Could not resolve module: org.sweetlemonade.eclipse.json [387]
<Many, many more!>
Kim W. Premuda
San Diego, CA USA