first of all there's an error in the net use statement ;-) i don't think it works that way
	Code:
	net use z: \\server\share /u:MyDomain\MyUser MyPassword
 If it still doesn't work remove the 
 line so you'll see there errors in the login message. Probably you have to put the %SystemRoot%\System32\net.exe to the ioFTPD system directory
	Code:
	[Events]
OnFtpLogIn = EXEC ..\scripts\mount_shares.bat
 were you missing the \ ? ^^
bye =)