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After creating a new css file (with the default template) and opening it, the content of the css file is visible - but Netbeans just hangs for ever. It's not possible to do anything anymore - the only thing possible is to explictly kill the java instance by using the shell.
Update: even inserting a <style> tag into a HTML document (or php file) causes Netbeans to freeze.
Seems to be fixed in gentoo now.. although another issue comes up (Exception 198041).