after upgrading to the latest version of YARPP (3.3.3) I got a white screen. So, I removed the YARPP plugin directory. My website was up again.
After installing YARPP and trying to activate it, I got this error:
"Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting ')' in /home/vhosting/f/vhost0035021/domains/nostromo.nl/htdocs/www/wp-content/plugins/yet-another-related-posts-plugin/lang/words-nl_NL.php on line 3"