OK, this is the preferences part of the BAM! reply:
<global_preferences>
<host_specific/>
<source_project>http://bam.boincstats.com/</source_project>
<mod_time>1337245179</mod_time>
<run_if_user_active>1</run_if_user_active>
<run_gpu_if_user_active/>
<suspend_if_no_recent_input>0</suspend_if_no_recent_input>
<cpu_scheduling_period_minutes>60</cpu_scheduling_period_minutes>
<idle_time_to_run>3</idle_time_to_run>
<work_buf_min_days>4</work_buf_min_days>
<work_buf_additional_days>2</work_buf_additional_days>
<max_cpus>2</max_cpus>
<max_ncpus_pct>100</max_ncpus_pct>
<suspend_cpu_usage>0</suspend_cpu_usage>
<cpu_usage_limit>0</cpu_usage_limit>
<disk_interval>300</disk_interval>
<disk_max_used_gb>20</disk_max_used_gb>
<disk_max_used_pct>50</disk_max_used_pct>
<disk_min_free_gb>1.5</disk_min_free_gb>
<vm_max_used_pct>75</vm_max_used_pct>
<ram_max_used_busy_pct>0</ram_max_used_busy_pct>
<ram_max_used_idle_pct>0</ram_max_used_idle_pct>
<max_bytes_sec_down>0</max_bytes_sec_down>
<max_bytes_sec_up>0</max_bytes_sec_up>
<hangup_if_dialed/>
<start_hour>0</start_hour>
<end_hour>0</end_hour>
<net_start_hour>0</net_start_hour>
<net_end_hour>0</net_end_hour>
</global_preferences>
The bold line is the CPU limit, as you can see it is set to '0' (you can verify this in your acct_mgr_reply.xml file).
Do you have local preferences set? They override project/BAM! preferences.
Please do not PM, IM or email me for support (they will go unread/ignored). Use the forum for support.