TTrayIcon at times do not showing the icon properly. Cannot get ON_PAINT working

[Nevada Smith]

I have a strange problem with TTrayIcon which happens only in Linux (XFCE & LXDE). Occasionally the tray icon gets set to an error icon (please see the attachment). Roughly 75% of the time the icon shows up okay, rest of the time the error icon is shown.

I am periodically changing the TrayIcon, although this is not animation.

Code: Pascal  [Select][+][-]

1. tiMain.Icon.Assign(FTrayProgressIcons[Index + 1].Bitmap);

• I tried tiMain.ShowIcon:= False; but this seem to do nothing. OnPaint event does not get triggered. Any pointers on how to get OnPaint event get working. Also, how do I invalidate the icon so that OnPaint gets triggered.
• Alternatively, what is wrong with what I am doing - Icon.Assign? Any tweaks which would get it to work in XFCE & LXDE?

[Nevada Smith]

export LAZUSEAPPIND=NO fixed the problem. Now I have to see if I need to use UnityWSCtrls.GlobalUseAppInd as mentioned at https://wiki.freepascal.org/How_to_use_a_TrayIcon..