[Zope] ZEO Problem

[beno]

Hi;
I'm reading the Plone book. It states that for Zope 2.7 (I have 2.78) 
ZEO is built in by default but must be instantiated thus:

cd /opt/Zope-2/7/bin
./mkzeoinstance /var/zeo

or some such code. So I tried this:

cd /usr/local/zope/278/bin
./mkzeoinstance.py ../../instance2/var/zeo

where 278 is my installation, instance2 is a Zope instance (I have 3), 
and mkzeoinstance.py is the command that works (mkzeoinstance by itself 
doesn't print anything to screen other than a command failed message). 
The Plone book then states that I must move Data.fs into the new 
/zeo/var dir, which I did. Everything seems to go well. If I start Zope 
using runzope I get this output at the tail end:

------
2006-09-02T13:15:35 INFO(0) Zope Ready to handle requests

However, if I try to log into the ZMI my passwords don't work. I even 
tried creating an emergencyuser and that didn't work, either. What to 
do? Also, should I move these other files into the new zeo/var dir?

Data.fs.index               
Data.fs.lock                
Data.fs.old                  
Data.fs.tmp                 

I tried that, also, with negative results, but it seems to me that if 
I'm moving Data.fs I should move these others as well.
TIA,
beno