wingpanel keeps resetting whenever I click an application

Hey,

Can you please run "killall -9 wingpanel && wingpanel" from your command line, reproduce the issue and post back the output you get?

Thanks.

Here you go:

[INFO 15:11:19.857859] Application.vala:155: System Panel version: 2.0.1
[INFO 15:11:19.857903] Application.vala:157: Kernel version: 4.4.0-47-generic
[FATAL 15:11:19.980154] wingpanel_widgets_overlay_icon_set_main_icon_name: assertion 'self != NULL' failed
[FATAL 15:11:19.980573] wingpanel_widgets_overlay_icon_set_main_icon_name: assertion 'self != NULL' failed
[15:11:20.072308 GLib-GIO-Critical] g_file_get_child: assertion 'G_IS_FILE (file)' failed
[15:11:20.072338 GLib-GIO-Critical] g_file_query_exists: assertion 'G_IS_FILE(file)' failed
[15:11:20.072343 GLib-GIO-Critical] g_file_get_child: assertion 'G_IS_FILE (file)' failed
[15:11:20.072348 GLib-GIO-Critical] g_file_query_exists: assertion 'G_IS_FILE(file)' failed
[15:11:20.072355 Critical] gee_abstract_collection_get_size: assertion 'self != NULL' failed
[15:11:20.072366 Warning] Theme.vala:508: Currently selected gtk+ theme 'elementary' does not provide a dock theme, fallback to the built-in defaults!
[15:11:20.279275 GLib-Critical] g_hash_table_get_keys: assertion 'hash_table != NULL' failed
[FATAL 15:11:20.378207] [AccountsService] act_user_get_user_name: assertion 'ACT_IS_USER (user)' failed
[15:11:20.508280 Warning] [DesktopFileInfo] Unable to create AppInfo
[15:11:20.517507 Warning] [DesktopFileInfo] Unable to create AppInfo
[15:11:20.517824 Warning] [DesktopFileInfo] Unable to create AppInfo
[15:11:20.540576 Warning] [DesktopFileInfo] Unable to create AppInfo
[15:11:20.575724 Warning] [DesktopFileInfo] Unable to get exec for Other

** (process:8680): CRITICAL **: string_contains: assertion 'self != NULL' failed
[15:11:58.474087 GLib-GObject-Warning] cannot register existing type 'GdkWindow'
[15:11:58.474163 Gdk-Warning] /build/gtk+2.0-KsZKkB/gtk+2.0-2.24.30/gdk/x11/gdkdrawable-x11.c:952 drawable is not a pixmap or window
[15:11:58.474227 GLib-GObject-Warning] cannot register existing type 'GdkWindow'
[15:11:58.474301 Gdk-Warning] /build/gtk+2.0-KsZKkB/gtk+2.0-2.24.30/gdk/x11/gdkdrawable-x11.c:952 drawable is not a pixmap or window
[ERROR 15:11:58.475419] [Gdk] The program 'wingpanel' received an X Window System error.This probably reflects a bug in the program.The error was 'BadWindow (invalid Window parameter)'. (Details: serial 9239 error_code 3 request_code 20 (core protocol) minor_code 0) (Note to programmers: normally, X errors are reported asynchronously; that is, you will receive the error a while after causing it. To debug your program, run it with the GDK_SYNCHRONIZE environment variable to change this behavior. You can then get a meaningful backtrace from your debugger if you break on the gdk_x_error() function.)
Trace/breakpoint trap (core dumped)

I know that X error from some race-conditions or access of gtk ressources across multiple threads. It might be related to something like that.