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JLink still not working with mBed on OS X

I just got an mBed board and I'm having trouble getting the J-Link to work on OS X even though I have version 4.90.

MattBookPro:gcc mbrandt$ JLinkExe 
SEGGER J-Link Commander V4.90b ('?' for help)
Compiled Aug 14 2014 10:26:36
Can not connect to J-Link via USB.

The serial port and the disk image both show up fine, so the hardware is connected, but I can't get the debugger to connect. I also tried doing the disable_cdc script and unloading the kexts, but that had no effect.

Any ideas?

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