Oops, missed a post when I moved them to this topic, so one is out of order.
What GTK / GNOME Shell theme are you using?
What’s the output of:
cat /etc/environment
And if it exists:
cat ~/.profile
When pasting terminal output, highlight it and use the Preformatted text </> button.
Alternatively, add three backticks ` above and below the text:
```
text
```