date_picker does't appear

Hey,

since a few days the date-picker icon doesn’t appear if I create a new custom post which has a few custom fields created with the types plugin.
The date-field can’t be filled without the date-picker. Since the field is required to create the post, it’s impossible to to publish a post of the described post type.
The problem doesn’t appear, if there is allready a date saved. So if I edit an allready existing post, the date-picker-icon appears.
If I allow multiple instances of the field, the icon doesn’t appear at first, but if I activate a second date field, the icon appears (the icon even stays, if I delete the second field afterwars).

The problem appeared about the time I got the 1.6.6.3 update, but I don’t know if there’s a connection.

Any ideas?

M.

https://ww.wp.xz.cn/plugins/types/