[Plugin: Category Posts Widget] Selected as Current Widget, but now can’t edit!

I love this widget! But now I’m stuck.

After I clicked ‘ADD’ and use ‘Category Posts’ as one of my sidebar widget for the very first time, that particular one is stuck (read: I cannot edit any of the features).

But when I add on more category posts widget under ‘Current widgets’, the rest is okay.

Pls click to see what I mean:
http://www.oureverydaythings.com/image/cat_post_error.jpg

‘CATEGORY POSTS : PARENTING POSTS’ has NO ‘edit’ button.

Pls help!

Thanks!