Bug#858096: [mate-panel?] Mate panel unstable, notification area icons disappear without warning

[michael (C0bb3r)]

Hi Adrian

On 19/03/17 09:43, John Paul Adrian Glaubitz wrote:
> Hello!
>
> On 03/18/2017 11:07 PM, michael (C0bb3r) wrote:
>> Thanks for your assistance. The .xsession-errors, syslog, and  dmesg files are attached. Also attached are a couple of screenshots showing what I mean.
> Attaching large files to bug reports should be avoided. It would have been better to upload
> the screenshots to a webspace. And screenshots should also be sent on request only as they
> aren't really necessary in most cases. But, oh well.
Duly noted.
> Anyway, from your .xsession-errors there seem to be two warnings which could be related to
> your problem:
>
> (mate-panel:1286): Gtk-WARNING **: Negative content width -3 (allocation 15, extents 9x9) while allocating gadget (node button, owner PanelActionButton)
> (mate-panel:1286): Gtk-WARNING **: Allocating size to GtkAlignment 0x55cfb821bdf0 without calling gtk_widget_get_preferred_width/height(). How does the code
> know the size to allocate?
>
> Other than that, there are also lots of theme-related warnings and since you have such a
> fancy theme, I'd try resetting the theme as first attempt. If that doesn't help, we need
> to investigate the two warnings above.
Switching themes has this effect: n.b. using only standard themes and 
associated icons no modifications apart from added shutdown made.
Blackbird - lose all notification icons apart from shutdown.
Blackmate - all icons appear.
Bluementa - lose bluetooth icon.
Blue Submarine - same as Blackbird.
Green Laguna - as above.
Green Submarine - as above.
Greybird - as above.
High contrast - as above and also get error "Clock has quit unexpectedly".
High contrast inverse - all icons appear.
Menta - same as Blackbird.
Traditional Green - as above.
Traditional OK - all icons appear.

Process used - I switched from one theme to another until icons 
appeared. Then switched from working theme (e.g. Blackmate) to another 
theme (e.g. Blackbird) to see effect. Each switch went from a working 
theme to a different theme.

I will use Traditional OK today and see how long the icons stay, 
tomorrow I will switch to Blackmate and test it. I will report back if 
the icons disappear from these two themes.

Cheers.
Michael.