Trigonometry Identities Not WORKING!

So I purchased this app a while back and it was working perfectly for what I was doing but now that Im doing Trigonometry Identities it has stopped working. When I go to press go nothing happens, nothing loads, it doesnt even go to the loading page it just sits on thequestion... Very disappointing because everything else seems to be loading and working fine.

Tasos2225 about Symbolab: Math Problem Solver, v1.5.1