Creating a task - dissapearing on date selection

Creating a task - dissapearing on date selection

Hi
 
In the past few days, when creating a new task from within a Contact, the task disappears (unsaved) as soon as the date is selected
 
This applies whether the task is created from the option at top right of screen, or via the link below the tasks for that contact
 
If a task is created, data entered (date left the same), saved, opened again - THEN the date changed, it works fine
 
Looking forward to great support as always
 
Ross