Hi there,
Just wanted to let you know that upgrading to Events Manager 5.5 resulted in a bunch of PHP warnings getting spit out, like so:
Warning: preg_match() [function.preg-match]: Compilation failed: nothing to repeat at offset 1 in /home/mmadminrdr/dev.rocketdogrescue.org/wp-includes/class-wp.php on line 205
About, a dozen altogether. Anyhow, it took awhile, but I finally found a thread that suggested this fix, which worked for me:
Just resave the permalink settings in Events > Settings > Pages > Permalink Slugs