Musescore 3.4 - Document Issues

Hello!

I've been having some issues with my documents lately:

1) Shortcut keys won't work anymore (i.e shortcuts for entering notes so making a score is much slower)

2) Anything that is entered in the document won't delete (So editing won't be possible).

Does anyone have any way of fixing this? I can't work on Musescore if this keeps happening.