I’ve been keeping my eye on this thread, and I’m still having the same issue occur where a PHP Code Widget vanishes upon save, when in use simultaneously with Widget Logic. The newest version of Widget Logic you’ve posted fixed where the logic field would remove itself, but if I check “Use ‘wp_reset_query’ fix”, it always unchecks itself on save.
I wonder still if the issue is with the PHP Code Widget. Only one instance of it can now live in the sidebar at any given point. Has Otto weighed in on this at all?
