Well I just checked a random 10 stocks that I would have had to short at one time or another with my new system and Ib showed 6 out of 10 were available.
The stocks were
alxn, agtx, btrx, cra, dusa, enz, glbc, mnkd, nabi, rigl
Ib had..... btrx, cra, dusa, enz, nabi, rigl
I'm...