"Add to" not working, sometimes.

If I add an Item (movie or else) to Watched or Wanted, then I am not able to add it to a Custom List too (I mean, when I click the "Custom" button... nothing happens!), unless I re-load the page showing said Item.
That happens if it's the first time I add the Item.
On the contrary, if the Item has already been added to a Custom List first, or to the Watched or Wanted ones, then the "Custom" button keeps working fine.
Noticed the issue in Opera and in Chrome, on Windows Vista.
That happens if it's the first time I add the Item.
On the contrary, if the Item has already been added to a Custom List first, or to the Watched or Wanted ones, then the "Custom" button keeps working fine.
Noticed the issue in Opera and in Chrome, on Windows Vista.

Is this on the item page itself or another page?

I've found the problem, it should be ok now.