Hello,
1) You can manage image size that you want to display there in element setting and it’s not related to theme update. Not there was medium size 300px width, that’s why you see the images centered within block width that is much bigger – 555px. I have changes the size of the images there. Check now.
2) I have passed your issue with the continue reading button to our developers. Once they fix the problem I’ll inform you. Don’t change access before this.
3) You have added the hashtag to the Instagram element settings that does not exist, that’s why you got that bug. I have removed the hashtag and it works fine.
4) Menu is fixed. Seems styles of your child theme had less priority than the optimized file of our theme. Check the menu now.
Regards