Altium Designer Summer 9 : Auto Route Issue

[sgaltium]

Hi,
Need Altium expert help on below issue.

Using “Auto route” in Altium, routed report shown as below:
Routing finished with 3 contentions(s). Failed to complete 1 connection(s) in 6 Minutes 52 Seconds

Physically view can see few un-route nets, but “Design Rule Check” report showing “Un-Routed Net Constraint” = 0

Anyone can commend how accurate Altium “Design Rule Check” report?


What is the recommending action for further step to resolve un-routed net?

I tried run again auto route (All) then with below result:
Routing finished with 0 contentions(s). Failed to complete 0 connection(s) in 2 Minutes 22 Seconds
But physically view can see more un-routed net and un-connected via!!! WHY?


Anyone can recommend any other powerful auto routing tool that able to route Altium PCB file format (.PcbDoc), after routed then can import back to Altium for further process?


Thanks.