More info from a duplicate bug report:
"When I login notification area icons appears (decorated by WM) centered on screen, just to disappear right after. After that a new window is spawned witch once again disappear.
The icon windows will keep flashing in the middle of the screen until i kill xfce4-panel. Once I start a new xfce4-panel the same thing happens once again.
The sound (xfce4-mixer) icon is attached to the panels notification area as expected, all other icons are affected by above mentioned problem."
We don't know yet if this is an expected new behavior in gtk+ or a regression…
More info from a duplicate bug report:
"When I login notification area icons appears (decorated by WM) centered on screen, just to disappear right after. After that a new window is spawned witch once again disappear.
The icon windows will keep flashing in the middle of the screen until i kill xfce4-panel. Once I start a new xfce4-panel the same thing happens once again.
The sound (xfce4-mixer) icon is attached to the panels notification area as expected, all other icons are affected by above mentioned problem."
We don't know yet if this is an expected new behavior in gtk+ or a regression…