Please give the debug version few more tries.
we found this issue in 5.9.5 and the debug binary couldn't reproduce. New version has the same problem but it a newer build than the debug I have.
WinSCP 5.9.6
Error message:
Invalid access to memory.
Stack trace:
(003E33EF)
(008689AA)
(0086AA12)
(008677CC)
(000624F6) ntdll.dll
(0000F13E) ntdll.dll.KiUserExceptionDispatcher
(004A5F97)
Status: unknown_rel_addr
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.