bottom menu gone

Hi! I've been having this issue today where if I go into build mode, the bottom menu completely disappears and no options from the top work, except live mode. But in live mode, the same thing happens where bottom menu is gone and none of the top works. This ultimately makes me have to force quit the entire game. 

This is in build mode^^^

And this is in live mode^^^

As you can clearly see, the bottom menu is gone after going into build mode. Although, I searched for a solution here and saw that removing the localthumbcache.package might help, which I did but I don't see any difference.

Please let me know if you have a solution. Thank you!