Beta1 seems to break Views?

I haven't traced the fault yet but the Beta1 release appears to break Views, giving errors like this;

Invalid argument supplied for foreach() in /Sites/htdocs/sites/all/modules/views/includes/view.inc on line 1693.
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') ORDER BY vid, position' at line 1 query: SELECT * FROM views_display WHERE vid IN () ORDER BY vid, position in /Sites/htdocs/sites/all/modules/views/includes/view.inc on line 1318.

Just to note that the previous dev version didn't appear to have this fault. Cacherouter is the only module I've upgraded recently...

I'll look into this when I get a minute.

Pobster