Yeah the new syntax for those commands is at the end of the big log file. It's probably not the most obvious place to look for it, but I wasn't expecting the log file to be included in it's entirety!
#push("N","target")
I've just taken a look at this and spotted something that I didn't see when I altered the command - setting the handle to "target" or "source" doesn't work! I'm very sorry I missed this (it's very small Wink ) - it must have been a bug from the beta. But you say it worked in the previous tk3 release? Or was that tk2?
For the moment, you can either use the player handle instead, or just leave it out completely (#Push("N")) which pushes the selected player. I'll get it fixed for next time!
Hmm I'm not sure about the board problems though, and a white screen isn't good at all Sad .
What's your intro program like, and how does it end? Which screen/board is white?
If you're porting your game from tk2, I'd suggest opening your boards in the board editor once and resaving them (this will change their format into tk3... I think!).
EDIT >> Yikes! When I said player number for the push command above, I meant player handle! Like "Bob". Sorry!