There is a problem with the ftdi driver related to  drscan. The last bit 
is never read.
The problem is in  ftdi_execute_scan(), at line 427 ( bit_offset++; ).
This will generate an offset of 32 in a drscan32, so bit 31 is never 
updated.

Commenting out this line the driver works with no problems, at first glance.
I tested this with a pic32 and a  new ft232h.

This driver works for me near 8x faster than with ft2232 driver, good job.

Thanks
Salvador.

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