Problem with nutsmail

#1
I am no sure wheather this is a bug but its seems like i have problem on 4.1.2 we have nutsmail implement on our shared hosting normally all domain to access webmail will be http://DomainName/mail and it will load nutsmail login page so now the problem is when we upgrade to 4.1.2 my client login to nutsmail which is a squrriel mail it got an blank page if i downgrade it back to 4.0.20 it is fine i have also try to force reinstall for 4.1.2 but it seems to be the same. Hope your can give me advise.
 
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