Netbeans 7.0.1 doesn't start new line when pressed enter

I use netbeans 7.0.1 on debian and fixed the issue by klicking on the info icon left to the <?php and then selecting "Change project default to HTML 4.01 Transitional"

It seems that the default is HTML 5 - and this generates a parser Exception. After switching the project default to the above mentioned setting I could use ENTER as normal - even on newly opened files.