(Android) Emulator was working fine yesterday, but won't play any games today.

[TkSilver]

First of all which version of PPSSPP are you using... (the play store release or a nightly and version)
Which version of S7 do you have... (snapdragon or exynos)

Those 2 questions might provide an answer, might. But if the problem is not what I think it is there are a few things you can also do. I am assuming you have done a full power cycle of your phone (shut down all the way and then powered back on). If you have a custom recovery on your phone you could also clear your jit cache and see if that helps too.