Firefly installation problem / invisible toolbar

Hi guys, 

I have read most of discussions related to Firefly installation issues, but i haven't found the answer to the problem that i have:

I recently bought leap motion contoller ,but i need Firefly to try it out in Rhino.

I downloaded latest Firefly build 1.0068 , 64 bit for Rhino 5 , and installation went smoothly, but when i open Grasshopper, there is no Firefly toolbar.

The previous one ( 1.0066, 64 bit ) worked fine, on the same computer.

Is there anyone who can help me with this problem?