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

<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 5.7.2

Error message:
Canvas does not allow drawing

Трассировка стека:
(001BEEE3)
(00422023) @Tb2item@TTBView@DrawItem$qqrp21Tb2item@TTBItemViewerp20Vcl@Graphics@TCanvaso

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

hello,

I left open the program with 3 sessions, and I have set turn off the display after 3 minutes and on resume, display the logon screen.

in a old version, 5.5 I think, the same problem with something like the system run out of resources.

WinSCP 5.7

Error message:
Canvas does not allow drawing

Stack trace:
[0134FC6F]
[015B2DAF] @Tb2item@TTBView@DrawItem$qqrp21Tb2item@TTBItemViewerp20Vcl@Graphics@TCanvaso