I started Libreoffice in failsafe mode and deactivated OpenGL / OpenCL.
After that Impress starts again to show the gui. But it was still freezing
after a while.
Then, I got into Tools -> Options -> Display and deactivated everything in
"image rendering" (there was an OpenGL entry ...).
Now, it looks like impress is working again.
So, maybe something related to display driver was delivered with 2004
which is not really supported by libreoffice ...
Thanks for the advice !
Please note that OpenGL GPU support has little to do with the OpenCL
features used in Calc, so you should be fine to reenable the OpenCL and
Also, OpenGL is being deprecated in favor of a Skia Vulkan rendering--that
is already in place for the 7.0 release of LibreOffice where OpenGL is only
available via the Advanced -> Expert Configuration dialog. There are
driver/GPU pairing issues still with Skia--and Vulkan vector engine may be
blocked, but driver support is more consistent.
Point is, when convenient take a 7.0 or 7.1 nightly build out for test drive
with Skia rendering support. Done with a "msiexec.exe /A" administrative
install of the MSI package. Assistance here: Installing in parallel on
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