Symptoms

Calendar control disappears during date selection of different month if date doesn't exists in the newly selected month (e.g going from 31 Jan to 31 Nov).
 

Diagnoses

Found source of bug is the data type of the control. 'Date' type causes it to break, 'DateTime' allows it to work.
 

Resolution

Submitted as a bug. Use the little arrows to cycle through the months to select as a workaround or use 'DateTime' data type.