I'm experiencing something similar with an everdrive, but according to my tests, this started on fw b6 and still present up until b8. I've already reported this to retrouSB customer support.
-------------------------
---------------------------------------------------------------------------------
Gaming since 1987 - Systems owned nowadays:
Xbox360 Consoles: Corona
Xbox Consoles: Xcalibur 1.6
PS3 Consoles: CECH-2511A
PS2 Consoles: V6/SCPH-30001R, V7/SCPH-39001, V9/SCPH-50001
PS1 Consoles: SCPH-7501, SCPH-5501(3), SCPH-9001
Sat Consoles: HST-0001 VA0
Gen Consoles: Genesis 2 VA3 (3)
Wii Consoles: RVL-CPU-01
N64 Consoles: NUS-CPU-05, NUS-CPU-02
Snes Consoles: SHVC-CPU-01, SNS-CPU-GPM-01 (2), SNS-CPU-GPM-02, SNS-CPU-1CHIP-01
Nes Consoles: AVS NES v2