Register pop-up not showing up

After upgrading to Beta 3, the register button is not working.

Code:

VM188:11 Uncaught ReferenceError: jQuery is not defined
    at eval (eval at d (core-compiled.js?_v=4a04e4c3:47:161), <anonymous>:11:5)
    at d (core-compiled.js?_v=4a04e4c3:47:161)
    at core-compiled.js?_v=4a04e4c3:154:121
    at core-compiled.js?_v=4a04e4c3:47:284
    at core-compiled.js?_v=4a04e4c3:102:461
    at HTMLScriptElement.h (core-compiled.js?_v=4a04e4c3:34:285)

This is a weird bug. Tried on Chrome, no...

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