first of all - thanks for the theme. Looks very nice and we appreciate your work. But, ...
I had a small problem with the "Theme Settings" screen while Gallery plugin activated ( https://wordpress.org/plugins/gallery-plugin/ )
first I thought that there's some problem with jQuery, because I've got the #jsAlert on. But I noticed also that I've got this error:
Fatal error: Allowed memory size of 50331648 bytes exhausted (tried to allocate 1966080 bytes) in .../wp-includes/SimplePie/Item.php on line 2736 in the "Tempera Latest News" section.
What I did
I removed the part of code which generates the feed from your site with the "fetch_feed" function.
I know the issue doesn't have to come exactly from your theme, but it can be caused by the hosting settings... but anyway.
Maybe you could consider some option for turning off that latets news section ?
So I just wanted to give you guys heads up, that there might be issues when running more complicated plugins on a website..
P.S.: The function "return_10" made my day ;)