Viewer images not showing up

I'm having a problem with App Inventor 2. Images in the web viewer/designer are not showing up and the canvas only fills the screen horizontally even though I've set it to fill parent. It worked just fine the first time I used App Inventor.The app Itself works well on the emulator on my phone, however I want to be able to edit it in the web browser and I can't do that with this problem.