The problem is that i have other hacks installed that modified editpost.php :(
have the same problem as KirbyDE, the post info gets screwed up if i stop editinf a post, yet still i cannot apply the update

Just change what is between these two lines in the editpost and that will include the fix. ;)

and

Don't forget to dd the second piece of code for the editpost. Stefan has fixed the code and separated it into 2 pieces of code. The second one is new.

It works great, Stefan, except for one small thing. If I put a phoney name in (or misspell a user's name), it will show guest like it is supposed to, but it will also show that phony or mispelled name above the word Guest. That shouldn't be in there, right? ;)

Yes, it should work that way.
Guest is the usertitle, so if your username doesn't exists, it will set the post's userid to 0 and the Guest's username to the one you entered

Ah, ok, Then all is well once again in the Stefan code. ;)

I am curious, though, why did you split the code this time instead of doing it all together? ;)

because of the preview.
If you click on submit changes but have an error in your new post (like too many images or such) you will get to the previewpage as well. but you cannot know this before the actual updatesection has been running.

so it's not possible anymore to keep it in one block, if you want the preview to work

Updated just the lines in editpost.php
I make a topic, then view it, press edit, change something, and then press preview. Then I press save, and there we go, everything gets screwed up again... :(
Have i missed something out in updating?

Ah, yes, but the code I sent you was in the same block and it worked fine. ;)

@djohn: the editpost.php changes should be enough.
it is working fine for me.

@Bob: you haven't tested the code good enough :)
if you have an maximum images limit you will see what i meant :)

Works like a dream in Gold!