Samsung Galaxy SII: OTA ROM Manager update to CyanogenMod: Verification Failed Howdi,

Basically as question says; 

Download and Install Cyanogenmod 7.1.0 from ROMManager App, reboot into system recovery, and lo and behold

E:failed to verify whole-file signature
E:signature verification failed
Installation aborted.


Also tried with the 'standard' download from the website instead of OTA, same issue even after verifying md5 hash

Anyone got any ideas?
I'd try putting the "standard download" on your device at /sdcard/update.zip and manually flashing it without using ROM Manager (reboot into recovery and select it yourself).  RM doesn't always play nice with Samsung devices.