Invalid access to memory - System::IntfClear

<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:
(00298DC6) System::IntfClear
(00087A6F) ntdll.dll
(000740C1) ntdll.dll.KiUserExceptionDispatcher
(004AFDBB) Dragdrop::TDragDrop::WndMethod
(00214D98) System::Classes::_18201
(000402B9) USER32.dll
(00036A55) USER32.dll
(0003538C) USER32.dll
(00034EAB) USER32.dll.DispatchMessageW

(00294258) System::HandleAnyException
(00087A6F) ntdll.dll
(000740C1) ntdll.dll.KiUserExceptionDispatcher
(004AFDBB) Dragdrop::TDragDrop::WndMethod
(00214D98) System::Classes::_18201
(000402B9) USER32.dll
(00036A55) USER32.dll
(0003538C) USER32.dll
(00034EAB) USER32.dll.DispatchMessageW

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.

@sloane.lebeau: 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.