I recently got a Lancelot FPGA for mining bitcoins but after:
Installing the driver: got the MAC version from
http://www.ftdichip.com/Drivers/VCP.htm all 2.2.18
Rebooting: Just to be sure that everything works.
Launch Asteroid: I prefer this client, it is cgminer based and is open source
Upon launching the client, it told me that drivers are conflicting so I disable them as it advised. But then I can't find my Lancelot from it but only my GPUs which are running at crap speed of 31.xx MH/S.
Then I rebooted and use cgminer instead, it says that it didn't find any USB devices and my Lancelot doesn't have the TX and RX lights flashing.
I am running OSX 10.9 Mavericks and installed the drive for the newest OSX possible, which is for 10.7 I think but it is already the latest.