Well, it seems to have fixed itself. It seems to be an intermittent problem. Last 3 times its worked for me. Thanks for the response.

Here is my log.  I can see there is an error in there. Here it is below:

14:10:28.5 .ctor: System.ArgumentException: An item with the same key has already been added.
   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at Plan_G3.Model.Vatsim.readAliases() in C:\Users\Tim\Documents\Visual Studio 2010\Projects\Plan-G3\Plan-G3\Model\Vatsim.cs:line 161
   at Plan_G3.Model.Vatsim..ctor() in C:\Users\Tim\Documents\Visual Studio 2010\Projects\Plan-G3\Plan-G3\Model\Vatsim.cs:line 87

Same issue for me, I see planes and ATIS, but no VATSIM controllers on the Plan-G map. However, they show up on the VATSIM list.

Win7 64 Bit, Plan G 3.0.3.56 with FSX