Accepted Tasks in Business Console

Hi

I have the default Task Inbox widget in a custom appspace, it is currently showing my tasks correctly.
The documentation states that once a task has been accepted it cannot be accepted by another. But this is not working for my task, it gets reassigned even if it has already been accepted.
I am using webmethods with fix levels as below:

MWS_10.3_Fix10
Business Console 10.3 Portal Fix 8
Business Console 10.3 Runtime Fix 6

Any Business Console gurus out there that can help?
Thanks