Hi Zach
The original error message (i.e. "..username or password incorrect..") was returned when I try to log into the Virgin TV Go app from my mobile phone.
Kath asked me to try resetting the password using the forgotten password link, and trying again. However, when I try resetting the password by clicking the reset link emailed to me, I get the DEF01 error code. Regarding this error, I just tried clearing the cache as you suggested, and I still get the error.
Regards
Raj583