Password Change isn't recognised

I am using Dreamweaver to build my site with 110mb.com. I recently changed my
password at 110.com and was able to log in there so the change worked ok. Then
however when I tried to upload from Dreamweaver I get an error message.
Obviously I had changed to my new password on the remote info page. I have now
changed back to my old password at 110mb and everything's fine again. However I
really need to have a new password pretty soon.
Why won't Dreamweaver accept my new password? I actually tried adding a new
site and used the same details along with my new pass but it still wouldn't
work. My new pass is 14 characters whereas my old one was much shorter, so
could this be the problem?