Class 'SlideshowPluginAJAX' not found

Hi, thanks for the great plugin. Works fine on one of my sites with WP 3.7, but with 3.7.1 I’m getting:

Fatal error: Class ‘SlideshowPluginAJAX’ not found in …/wp-content/plugins/slideshow-jquery-image-gallery/slideshow.php on line 40

Tried reinstalling, still the same issue. Pls let me know what could be done about it. Thanks.

http://wordpress.org/plugins/slideshow-jquery-image-gallery/