Yet another blog
Recordtype Selection screen not available for selection
There was an issue on one the client orgs where one user was not able to select recordtype selection screen. Every time she clicked on the new button it bypassed the recordtype selection screen opened the record with default recordtype.
First i checked if that user profile has access to recordtype, which the user profile had access to. After some head banging it turned out that the user had selected default record type in the My settings page.
Click on the name of the user and from the drop menu click on My settings
Click on Display & Layout -> Set Default recordtypes
and uncheck the checkbox against the object which you want the recordtype selection screen to appear.
Hope this helps