I upgraded from 3.1.13 to 3.2.6 without any problems.
I have only one problem: 2 Customers Tab shows and only the Customer Information Center appears on it, on both. Like on this screen shoot.

I redo the upgrade several times but it doesn't helped. As I checked this information stored in the ZZZAuto.pm file.
I removed the $Self->{'Frontend::Module'}->{'AdminCustomerCompany'} and the $Self->{'Frontend::Module'}->{'AdminCustomerUser'} area from my original ZZZAuto.pm - comes from 3.1.x system - and now I have Customer Info Center, Customer User Administration, Customer Company Administration under the Customer Tab.
Any idea what causes this issue?
Is this an acceptable solution?
Any help would be appreciated.
Regards!
Zoltan