A somewhat recent Chrome update made it so you have to enable developer mode in the Chrome settings to get TamperMonkey to be able to inject scripts:
Also, the ‘official’ version of Ultimate Timeline hasn’t yet been fixed since the last WaniKani update that broke it, so be sure to look toward the end of the Ultimate Timeline thread on the forums for some fixes that other users have come up with.
Although I started working on fixing the official version, I haven’t had time to finish.