Cannot save project or export

Dear all,

I have use the former version for 2 months ago, but today I try to open and create new projects, everything was frozen in the file saving pop up screen, cannot type anything and the only thing I can do is killing the app to let the computer work again. I tried to update to 3.1.3 but same issue still exist. I am not sure it is because I have installed other apps (I remember only Firefox) or any other reason.

Thanks very much!