Settings files save error

Ever since upgrading from Qt Creator 4.10.2 I get constantly spammed with ~5 error message boxes about invalid settings files, unable to write settings file etc.

Using same roaming profile on a machine with Qt Creator 4.10.2 installed, I get no problems or errors.   Roaming profiles stored on a UNIX file server and shared via CIFS.

Issue affects versions starting at Qt Creator 4.11.x and up through Qt Creator 4.12

Upon opening Qt Creator 4.11.x > message box error:

"No Valid Settings Found"

No valid settings file could be found.

All settings files found in the directory "\\<server>\<user>\AppData\QtProject\qtcreator\cmaketools.xml" were unsuitable for the current version of Qt Creator, for instance because they were written by an incompatible version of Qt Creator, or because a different settings path was used.

Repeats for toolchains.xml,

Then "Cannot create file \\<server>\<user>\AppData\QtProject\qtcreator\devices.xml: the system cannot find the path specified.

Repeats for default.qws

Then "Could not save session to file \\<server>\<user>\AppData\QtProject\qtcreator\default.qws

Repeats for all .xml files.   debuggers.xml, qnc.xml, qtversion.xml, etc.

Folder has permissions for everybody.

In fact, Qt Creator is creating 0 byte files at the proper location, but with random additional extensions:

07/14/2020 10:39 PM 0 cmaketools.xml.clzWPC
07/14/2020 10:43 PM 0 cmaketools.xml.lHjTpl
07/14/2020 10:43 PM 0 cmaketools.xml.XQberE
07/14/2020 10:43 PM 0 debuggers.xml.Ieyoez
07/14/2020 10:43 PM 0 debuggers.xml.KnIhYU
07/14/2020 10:39 PM 0 debuggers.xml.vBgyum
07/14/2020 10:39 PM 0 default.qws.eYGted
07/14/2020 10:43 PM 0 default.qws.fvhdUn
07/14/2020 10:43 PM 0 default.qws.ugRZRS
07/14/2020 10:43 PM 0 devices.xml.UBjgKc
07/14/2020 10:39 PM 0 devices.xml.vNvpgB
07/14/2020 10:43 PM 0 devices.xml.wDWLtH
07/14/2020 10:43 PM <DIR> generic-highlighter
07/14/2020 10:40 PM 8,376,320 helpcollection.qhc
07/14/2020 10:39 PM <DIR> macros
07/14/2020 10:39 PM <DIR> mimetypes
07/14/2020 10:43 PM 0 profiles.xml.ErTmsr
07/14/2020 10:43 PM 0 profiles.xml.GCgFrz
07/14/2020 10:43 PM <DIR> qnx
07/14/2020 10:43 PM 0 qtversion.xml.GfPoHJ
07/14/2020 10:39 PM 0 qtversion.xml.tFqSYa
07/14/2020 10:43 PM 0 toolchains.xml.mpVfZu
07/14/2020 10:39 PM 0 toolchains.xml.Qcxmgp
07/14/2020 10:43 PM 0 toolchains.xml.Twlvzz

If I use Qt Creator 4.10.2 or earlier, everything works fine.

Any version after 4.11.x has this problem.

Unfortunately it constantly happens over and over, making Qt Creator nearly useless.

I have cleared path environment variables, Qt related registry settings, uninstalled and re-installed Qt Creator, deleted the AppData\QtProject folder (which Qt Creator recreates properly), set the folder permissions allow all... nothing seems to work.