We're developing a multi-user touchscreen WinCC OA application which should support a user logging out so another user can log in.
The application is intended to run in single-application "kiosk" mode with the only input being from the touchscreen.
The functionality for this was working correctly until I installed the latest v3.17 release (P012) on our Red Hat Enterprise Linux 8 testing rig; now when the user logs out, a warning dialog is generated which reads:
NB: StartPanel is the top panel in our panel topology.You have no permission to display this panel: StartPanel !
The warning dialog seems to appear when calling the STD_LogoutCurrentUser() function.
I've confirmed that the problem occurs on P012 on my Windows 10 development machine, however the problem does not occur on P005 (Also Windows 10).
I'd try to narrow it down as to which patch causes the issue but I can't see where to download patches P006 to P011.
Obviously displaying such a warning is an issue for our users, what's worse is that the dialog appears behind the main application, which means it cannot be dismissed, and since it's a modal dialog it blocks use of the rest of the application—so it is a big issue for us.
If anybody has any ideas why this might be happening, I'd appreciate some help!
With thanks,
Graham