2014.4.16 release of HTTPS Everywhere extension has broken Tumblr click events
As of the 2014.4.16 click events on Tumblr in Chrome 34.0.1847.116 m are being flatly ignored if HTTPS-E is enabled, e.g. enlarging images in posts, Reblogging and Liking. Works if extension disabled.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information