Invalid access to memory - TQueueController::AllowOperation

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 6.1.1

Error message:
Invalid access to memory.

Stack trace:
(000A5D53) TQueueController::AllowOperation
(0009812F) ntdll.dll
(00077D31) ntdll.dll.KiUserExceptionDispatcher

(000A5D53) TQueueController::AllowOperation
(0009812F) ntdll.dll
(00077D31) ntdll.dll.KiUserExceptionDispatcher

(000A5D53) TQueueController::AllowOperation
(0009812F) ntdll.dll
(00077D31) ntdll.dll.KiUserExceptionDispatcher

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

@arnelgempeso: Thanks for your report.
I have sent you an email with a debug version of WinSCP to the address you have used to register on this forum.