I used this hand mixer for the first time yesterday and have the same problem - one of the beaters will not come out. I was so pleased to read your comment and thought my problem would be solved however, with a gentle and slight turn both clockwise and anti-clockwise, it is well and truly stuck. I've emailed Andrew James and just waiting for a reply. The mixer whilst working was great, so just hope I can get this beater out otherwise I have made a very expensive cake:-)
UPDATE!!!!!!!!!! Having read more reviews, it was suggested that the button should be pressed HARD so I tried again and hey presto - the beater shot out! I am so grateful for Amazon reviews!