Settings of my php.ini file
extension=dbg.so
[debugger]
debugger.enabled=On
debugger.profiler_enabled=On

Here's my input to dbg-cli:

dbg>set mode 1;
dbg>set mapurlroot http://localhost/
dbg>set mapremoteroot /opt/apache2/htdocs/
dbg>set maplocalroot /opt/apache2/htdocs/
dbg>file /opt/apache2/htdocs/test/index.php
Reading symbols from /opt/apache2/htdocs/test/index.php...done.
dbg>run

Program exited.
Session start timeout has expired.
Program is not being run.
dbg>

i am using php5 and apache 2

dbg-cli 2.11 is an experimental software and probably there are some weird bugs or problems under various platforms.
I hope I will have sufficient time to take a closer look and fix the problem in the next release.