Errors:
+ Engines/BulkOrders/Books/BOBLargeEntry.cs:
CS0012: Line 97: The type 'System.Collections.Generic.HashSet`1<T0>' is defi
ned in an assembly that is not referenced. You must add a reference to assembly
'System.Core, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
Ah doy! No wonder, thanks Vorspire.Add "System.Core.dll" to RunUO/Data/Assemblies.cfg - It's a .NET 4.0 feature.