<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 5.7.5

Error message:
Invalid%20access%20to%20memory.%0D%0A%0D%0AStack%20trace%3A%0D%0A%280024E7AB%29%20Vcl%3A%3AComctrls%3A%3ATTreeNode%3A%3AGetTreeView%0D%0A%2800062496%29%20ntdll.dll%0D%0A%280000F13E%29%20ntdll.dll.KiUserExceptionDispatcher%0D%0A%28003DE825%29%20Customdriveview%3A%3A_16443%0D%0A%28003DE825%29%20Customdriveview%3A%3A_16443%0D%0A%28003DE8B4%29%20Customdriveview%3A%3ATCustomDriveView%3A%3AIterateSubTree%0D%0A%28003EFFCF%29%20Driveview%3A%3ATDriveView%3A%3AValidateDirectoryEx%0D%0A%28003DE585%29%20Customdriveview%3A%3ATCustomDriveView%3A%3AValidateDirectory%0D%0A%28001F2E27%29%20Vcl%3A%3AExtctrls%3A%3ATTimer%3A%3ATimer%0D%0A%280034021C%29%20System%3A%3AClasses%3A%3A_18201%0D%0A%28000152F7%29%20USER32.dll%0D%0A%2800015D35%29%20USER32.dll%0D%0A%28000167BF%29%20USER32.dll%0D%0A%2800016885%29%20USER32.dll.DispatchMessageW

Status: not_matched

The problem happens rarely. I cannot reproduce it.