Created an attachment (id=8425) [details]
folders

Hi 

os Ubuntu 17.10 gnome
TB is 52.6.0 
QF is 4.9.1 

when using the qf option command, tab color, by right clicking on the folder
select tab color then chose color, nothing happens 

Michael

This option only works if you chose either of the themes

Flat Style  (default)
Apple Pills

All other Themes do not support coloring 

In "Bling my Tabs", you must have selected Buttons or Toolbarbuttons which are
not colorable because they are painted directly by your OS.

maybe the option should not be selectable if Flat/apple themes are not in force

Created an attachment (id=8426) [details]
4.9.2 prerelease 15

Try this version, I added a menuitem prompting to change the theme in order to
support colors.

Select different Theme to support coloring...

this will open the "bling my tab" layout options to select a different palette
compatible theme. Really, flat style is the best one for this, Apple Pills is a
little sketchy.

(menu item will be fully localized on release)

Fixed in 4.10, released on 25/06/2018