to change the checksum if you search your library for sha you will see a file named realms 1.5.8.sha and you open that with notepad and delete the code in it and find in the launcher log after attempting to load minecraft where it says stuff about checksum and says
"java.lang.RuntimeException: Checksum did not match downloaded file (Checksum was 0bfc90a1e07d9c655489f65125a33a486849db7f, downloaded 67d71bc60acdd3a3f04484f181ed556a470f3e77)"
you put what it says the checksum was not what it tried downloading
How long do these crash reports usually take to resolve and I get to play minecraft again? Also if I were to delete minecraft and everything but the worlds and saves would I be able to play?
yes sir, the bug happens every time I am moving the mouse and closing the inventory at the same time. If you need ill upload a short video to show exactly what im talking about. Also i went back to 1.9 to test and see if this would be a 1.14 only bug and i think it is because in 1.9 i didnt have this happen.