Newsletter has Greyed out Customers box when adding one customer at a time

Hi,

I hope someone will be able to help with this issue regarding the Newsletter feature.

I recently had my site upgraded to version 2.2.0.0.

When preparing a Newsletter I decided to do a test post to one of our test accounts.

I selected Customers in the drop down box then selected the demo account in the autocomplete area, I hit enter, but the box below remained greyed out and I could not add the "Customer" I had selected.

Is there something I am doing wrong?

If so can anyone tell me what I'm doing wrong?

Otherwise, does anyone have an idea on how to fix it?

TIA

Cheers
justme

I have included a pic showing the error. The customer name appears in the left menu bar after hitting enter. Clicking Send does not send the Newsletter.

Any help will be much appreciated.

Cheers