Items Manager - ver: 1.4

[Jordy_NL]

I have some trouble with saving custom fields. When I make a custom field, say: TEXT. And i'm making a new item, I see the new custom field. But when i'm filling in the field and saving my new item, it doesn't show my new custom field. He didn't save my custom field. When I manually put <text></text> tags in the xml file, I see my custom field online. But when i'm editting and saving it again, my custom field in the xml file is gone.
Somebody got the same problem? Or know a solution?