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Description of problem: adding an icon to the panel, using right click in applications menu/add to panel, let's the application menu stuck (no longer able to open it, until restart of the component).
Do you mean "Add to Favorites" ?
No, I mean - add this launcher to panel (in fallback mode, of course :)).
The effect occurs just by opening the context menu, not by adding an item to the panel. Besides that, it's also not possible to add an icon to the desktop (maybe because the desktop does no longer support icons).
Sorry, I'm having trouble understanding what you are talking about ... not really succeeding in guessing what you mean by various things. (E.g., what we call the panel is the bar at the top of the screen. There is no way to add icons to it.) Maybe you can describe a step as if you were describing it to someone who had no experience - "Click on where it says Activities at the upper left corner of the screen", etc.?
I was talking about Fallback Mode.
steps to reproduce: System-Settings / System-Information / Graphics / activate Forced Fallback Mode. re-login Open Applications menu, open a submenu, e.g. Internet / right click on an application icon. Try to open the Applications menu again
filed upstream bug as well: https://bugzilla.gnome.org/show_bug.cgi?id=644227
This has been fixed upstream.