Usb drive does not boot anymore

I just bought a brand new Kingston SE9 G2 USB 3.0 64GB.
Formatted it with Easy2Boot.
It booted a first time.
I added more isos, it stopped booting. But I can still read and write to it as a data drive.

I format it again. Still do not boot.
Thinking it's my computer BIOS that is messed up, I tried an older usb drive that also has Easy2Boot and that worked.
Any pointers how to debug this weird problem?
Long Vu 16/11/2016

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