[horde] Problems opening horde

[Marco Maiani]

I have horde2 with Imp, kronolith, turba, nag and everything worked very 
well until this morning. Suddenly horde stopped working with this message:

Notice: unserialize(): Error at offset 0 of 33 bytes in 
/usr/share/horde2/lib/Auth.php on line 250

I understood that horde can't find the credentials from users but I 
don't know how to fix it. Do somebody have an idea about what to do to 
restart horde?


Marco