Right ok, so i think i see part of the problem. It looks like when you set some text for the caption in the Automatic Captions tab, AND you have SC configure to auto add captions to every capture, it will NOT add your custom typed text to the caption.
By default the text in the Automatic Captions tab includes "%filememo%" which will already include whatever you type in the post capture dialog, so you see it. But if you change the text there, you will not.
I think i can fix this.