Save As dialog closes as soon as it opens..

This issue just started a few hours ago and I'm not sure why, but everytime I try to overwrite a file the dialog closes immediately. I couldn't find any articles specifically related to my issue so I'm having a bit of trouble, I'd really appreciate it if someone could help me.

I'm not really sure what info to give out since I'm not tech-savvy, but feel free to ask me..