Error with 4.0.1 version

Hi,

I used to have the 3.x version of vSlider on my blog which worked like a charm, but the upgrade first to 4.0 resulted in complete disfunctioning of the plugin (even the icons on the admin page disappeared…), then a manual install of 4.0.1 fixed them – yet, I keep getting the same error message on the admin side whenever I want to change something and save it:

Warning: preg_match() expects parameter 2 to be string, array given in /path/to/my/wordpress/wp-includes/formatting.php on line 2529

Warning: Cannot modify header information - headers already sent by (output started at /path/to/my/wordpress/wp-includes/formatting.php:2529) in /path/to/my/wordpress/wp-includes/pluggable.php on line 897

Cache is set to 777, everything should be fine…