Do you see the splash window?
If with "splash screen" you mean the window saying "Initialising NetSurf - OS4 version"
then yes.
If not:
Are you running at least AmigaOS 3.5?
Although "yes" above: I`m running OS 3,9 with BBs I & II/WarpOS 16.1.
Do you have a PNG DataType installed and active?
Yes.
Do you have any weird 3rd party patches or replacement components?
Nothing of this kind in the Statup-sequence.
But I have things like "NetClockCron" in WBStartup.
How much RAM do you have free when you start NetSurf?
Currently I have 1.876.672 Bytes CHIP and 79.745.448 Bytes FAST available (IBrowse and YAM running).
If you do see the splash, then I'd have expected a little bit more output.
As I already pointed out, there are a lot of text lines rushing through the shell window. I just wrote down the content of the last line on a sheet of paper to be able to post it here after the reboot.