Thanks for your reply Airbot, but it did not work for me. I deleted Iconcache and rebooted.
Immediately after reboot the icons come up in the desired size, but then, after a flicker, they are resized smaller. How can I find out what causes this resizing ?
Another piece of information : If after they are resized smaller, I check the settings of the desktop context menu under View, it indicates Medium. If I then modify the setting into Classic or Large and then go back to Medium, then they are resized to what I want. Unfortunately, this setting is lost when I reboot or suspend.
Any new ideas ?
Thanks again.