I have a desktop and a laptop, both running Linux Mint 20.3. As far as I can see, they are set up the same way. I have checked OS Themes and gambas settings, but there is nothing that stands out as being different.

But there is a difference, does anybody know where I might find a way to correct this?

<IMG src="https://www.cogier.com/gambas/Icons%20Zoostorm.png"> </IMG>
<IMG src="https://www.cogier.com/gambas/Icons%20Inspiron.png"> </IMG>

 do they both have the same icon themes installed?
gnome-icon-theme etc

dpkg-query –list *-icon-theme

 Some time ago I found it can make a difference using the tiny/small/medium/etc names as opposed to the size value.
explicit size value like Icon://16/save gives the colour icon and icon://small/save gives the rubbish one.

I reported it as a bug but i'm not sure it was fixed.

Ahh, one is tango-icon-theme the other humanity-icon-theme, but how do I change it?

cogier said

Ahh, one is tango-icon-theme the other humanity-icon-theme, but how do I change it?

well there's 3 places.

gambas settings.

Menu  System/Look and feel/Appearance   , Theme/Customise/Icons (gtk settings)

Menu  System/Look and feel/Qt5 settings (install qt5ct if it's not there) then go to icon theme

Sorry but where is this: -

gambas settings.

Menu System/Look and feel/Appearance , Theme/Customise/Icons (gtk settings)

Menu System/Look and feel/Qt5 settings (install qt5ct if it's not there) then go to icon theme

cogier said

Sorry but where is this: -

gambas settings.

Menu System/Look and feel/Appearance , Theme/Customise/Icons (gtk settings)

Menu System/Look and feel/Qt5 settings (install qt5ct if it's not there) then go to icon theme

aah on MATE mate

qt5ct in the command line for QT configure

i'm not too sure about GTK icon settings as you haven't said what desktop you are using yet

Ahh. Sorry. I use Cinnamon.

System settings / Appearance / Themes

That is what I thought, but there is no visible way to change it.

<IMG src="https://www.cogier.com/gambas/DeskTop.png"> </IMG>

 I don't get what you mean?

On my cinnamon on that page we've both snapshoted if i select a different icon set the desktop icons all change instantly and my gambas app icons change once i close and re-open them.

 This is my issue. It is all setup as standard on both computers, but at some time I must have done something to change something in the background. I just don't know what!