Hi Jonny, what operating system are you running on?

V4 does use a new font for the UI, somehow that is not working well on your system.

You might try setting v4 to use the same font as v3, you an do that by going to Options > General and press the "Edit .ini file" button.

Inside of moi.ini go to this line in the [UI] section:

UIFontNameV4=Open Sans

And change it to:

UIFontNameV4=Arial

- Michael