same problem here.

mIRC v6.31
MSIE 7.0.6000.16575
Windows Vista Home Premium 32-bit
Intel Core 2 Quad Q6600
Norton Internet Security 2008

1 C:\Users\Owner\AppData\Roaming\mIRC\moo.mrc $true 2ddcadd1cf29d4c8da28579abbf13d5f

/remote off does fix the problem in my case. also note that the problem was occurring before i had the moo script installed.