Fonts doesn't look properly

I have a problem with my new installed libreoffice running under linux mint kde.

Somehow the fonts look really bad when I open my documents with libreoffice.
When I print them they are normal again (as you can see in the pdf print in the screen shot)

Does anyone know how I can change this?

Thanks a lot

(Nothing for sure, of course!)

Check if the option ‘Use OpenGL for all rendering’ is disabled under ‘Tools’ > ‘Options’ > ‘LibreOffice’ > ‘View’
It does not work correctly sometimes or is not correcly blacklisted depending on your graphics hardware/drivers.

(5.1.6 is not the most matured version in the 5.y series. V5.2.7 or even V5.3.5 might be a better choice if you need V5.y features. Otherwise V4.4.7 should be the best debugged “still” version.)

I installed now V5.2.7 and its working. Seems like you were right and it’s a bug in the V5.1.6.

Thanks for the advise.