With bcm4311 works perfectly.

Same problem with my card. I have a canyon cnp-wf518 card with rtl8187 chipset. Allegedly pre BT4 version offers much better and more stable driver. Left us to wait and hope.

I have a canyon wf518 with RTL8187R chipset. In BT4 work fine, but slowly. For 2 hours only gathered 26 IVs. BT4 is running in vmware and the drivers did not change. What I do?