I'm glad you solved your first two problems. As for this new problem, it seems like the solution is the same as for the other one. Tab Box > Background
. Toying with this myself, I found that changing the background to white solves this problem. (view the image below)
But if it's still occurring while you already changed it to white, I recommend checking if the forum's page is a different theme. If so, you may want to edit that theme or simply change the page's theme to the one you're using.
How to check or change a specific page's theme:
(view the following screenshot)
Directions are provided below the image.
Open up your Enjin Admin Panel
and click "Pages
" Then choose the page that has your forums,
then, click "Page settings
" to open up the settings for that page. (view image below)
Once you click on "Page Settings
" it should open up something that looks like this (view image below) Then, you would want to select where it says "Select Page Theme
" *view highlighted section in image*
Select the proper theme by clicking on the down arrow where it says "Select page theme
I hope this generally helps you fix this problem. I recall encountering problems such as these that I couldn't figure out, it was quite an annoyance. If this solution doesn't help you, let me know and i'll try to find another one for you.