Dude, just don't change your mac when trying to use that. Its the same with wpa_supplicant when using that to connect with WPA networks.
Second of all:
aireplay-ng -3 -b (bssid) -h 00:11:22:33:44:55 rausb0
It sounds like your trying to get a WPA handshake... if so run
aireplay-ng -3 -b (bssid) -c (client Connected) [Interface]
then you don't need to spoof your mac.
You can find out if a client is connected buy
try that out, mesg back and let me know