Created attachment 177587 [details] screenshot of the problem Please see the screenshot. There's plenty of empty space but for some reason the buttons to subscribe are not even large enough to show the entire text.
Those are supposed to be icon-only buttons. It seems that the icon theme you are using is missing that particular icon. The text is only a fallback mechanism for the icon being missing. Note that Kasts has been developed with breeze-icons as the main intended icon theme. You can use another icon theme if you want, but if an icon is missing, then the interface obviously cannot show it. I think the app is supposed to fallback to breeze-icons for missing icons (but I'm not 100% sure anymore). So, I think the issue should be solved by installing breeze-icons.
It was on my work computer… I will investigate what is happening next week when I'm there again. At home I use oxygen and it shows the icon, I don't really remember how it's set there.
Yeah, oxygen should be an icon set that is complete enough to have almost all required icons. I don't know which icon theme your screenshot is using. It's probably the default one for whichever desktop environment you are using. (It doesn't look like plasma, but it could be heavily modified of course.)
It is plasma6 that I'm using :D But it used to be plasma5 so maybe some setting didn't get migrated properly there… Do you know what I should be looking at when I'm on that machine?
You should check which icon theme is used/installed. It definitely isn't breeze-icons, which is recommended for Kasts and any KDE application. I guess oxygen will still have sufficient coverage to be ok. But basically, with any other icon set, you're on your own. KDE in general does not want to pin down people, so breeze-icons and breeze style aren't hard dependencies, but there's also no guarantee that things will look ok if you use something else.
I'll close this now. There's nothing that we can do if the app is used with an incomplete icon theme.
Sorry I didn't forget this, but life got in the way and I haven't visited the office since.