Quark default doc/compilation error

Hello - I’m running Quark 7.3 under OS X 10.5.5. When I use Script Editor to compile

tell application "QuarkXPress"
	tell default document 1
		set page height to "11"
	end tell
end tell

I get the message “Expected end of line but found class name.” with “document” highlighted. I see similar code successfully compiled in examples throughout the forum. Does anyone have any ideas, or have this problem?

Thanks very much…

Reboot fixed it - can’t explain.