Ok. I decompressed the archive and ran NetSurf without touching anything. It works.
Either the options of 1.3 version are not compatible with the new version or version 1.4 doesn't like some of my settings.
Update: I did a little research on the problem. I think there is a bug in the new version and it is triggered by the fullscreen setting!
When it is set to 0, everything works ok. When it is set to 1, NetSurf insists to open in a window at the WorkBench screen. All graphics inside the window appear very messed up and when i quit, i get the message "free: start of block corrupt!" from ixemul. Changing the fb_depth doesn't help.
None of this occurs in version 1.3.