I use nova skin resource pack creator and for some reason it's doing this. It won't let me zoom in at all. Any ways I can fix this?
I recommend to use paint.net, because you got more control over what you are doing.
If you want to create models, I recommend Blockbench and notepad++ together.
That sometimes happens if you've been using it for a long time. Just restart it, and it should go back to normal.