TFS does not load custom assemblies

I am having problems trying to force my build controller / agents to select the build from the reference used in my build process template.

I read about this issue on several blogs and unfortunately I was unable to resolve this issue:

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I can confirm the following:

• TFS 2012 without Visual Studio 2013 Updates Update 1 (to create activity and update build process template)

• One build controller with multiple agents

• TFS build installed inside and inside control source

The correct path is set in the build controller with a service restart:

User activity is correctly resolved in the template when following the guide lines used in these blogs:

http://www.ewaldhofman.nl/post/2010/04/29/Customize-Team-Build-2010-e28093-Part-4-Create-your-own-activity.aspx

http://blogs.msdn.com/b/jimlamb/archive/2010/02/12/how-to-create-a-custom-workflow-activity-for-tfs-build-2010.aspx

I can view the link in the XAML of the build process template and it looks fine with no validation errors and my code work looks correct.

Code below:

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Activities;
using System.Text.RegularExpressions;
using Microsoft.TeamFoundation.Build.Client;
using Microsoft.TeamFoundation.VersionControl.Client;

namespace FireWatch.TFS
{
    [BuildActivity(HostEnvironmentOption.Agent)]
    public sealed class AssemblyUpdater : CodeActivity
    {
        #region Static Methods
        #endregion   

        #region Property Variables
        #endregion

        #region Constants and Read-Onlys
        private const string ASSEMBLY_VERSION_REG_EX = @"\(""\d+\.\d+\.\d+\.\d+""\)";
        private const string ATTRIBUTE_REG_EX = "AssemblyVersion";
        #endregion

        #region Accessors

        [RequiredArgument]
        public InArgument<int> Major { get; set; }
        [RequiredArgument]
        public InArgument<int> Minor { get; set; }
        [RequiredArgument]
        public InArgument<int> Build { get; set; }
        [RequiredArgument]
        public InArgument<Workspace> Workspace { get; set; }

        #endregion

        #region Encapsulation

        private void UpdateAssemblyInfo(IEnumerable<string> assemblyInfos, int major, int minor, int build)
        {
            foreach (string myAssemblyInfo in assemblyInfos)
            {
                string myFileText = File.Exists(myAssemblyInfo) ? File.ReadAllText(myAssemblyInfo) : string.Empty;

                if (myFileText != string.Empty)
                {
                    Regex myRegex = new Regex(ATTRIBUTE_REG_EX + ASSEMBLY_VERSION_REG_EX);
                    Match myMatch = myRegex.Match(myFileText);

                    if (myMatch.Success)
                    {
                        string myVersionNumber = myMatch.Value.Substring(ATTRIBUTE_REG_EX.Length + 2,
                                                 myMatch.Value.Length - ATTRIBUTE_REG_EX.Length - 4);

                        Version myCurrentVersion = new Version(myVersionNumber);
                        Version myNewVersion = new Version(major, minor, build, (myCurrentVersion.Revision + 1));

                        string myUpdatedAssemblyText = myRegex.Replace(myFileText, ATTRIBUTE_REG_EX + "(\"" + myNewVersion + "\")");

                        File.WriteAllText(myAssemblyInfo, myUpdatedAssemblyText);
                    }
                }
            }
        }

        private void CheckOut(Workspace workspace, IList<string> assemblyInfos)
        {
            if (workspace != null && assemblyInfos != null && assemblyInfos.Any())
            {
                workspace.PendEdit(assemblyInfos.ToArray());
            }
        }

        private IEnumerable<string> GetRelevantAssemblyInfos(Workspace workspace)
        {
            IList<string> myReturn = new List<string>();

            PendingChange[] myPendingChanges = workspace.GetPendingChanges();

            foreach (PendingChange myPendingChange in myPendingChanges)
            {
                string myPath = AssemblyInfoPresent(myPendingChange);

                if (!string.IsNullOrEmpty(myPath))
                {
                    myReturn.Add(myPath);
                }
            }

            return myReturn;
        }

        private string AssemblyInfoPresent(PendingChange pendingChange)
        {
            string myReturn = string.Empty;

            if (pendingChange != null)
            {
                string myParentDirectory = pendingChange.LocalItem;
                string myParentLevelAssemblyInfo = myParentDirectory + @"\AssemblyInfo.cs";

                string myPropertiesDirectory = pendingChange.LocalItem + @"\Properties";
                string myPropertiesLevelAssemblyInfo = myParentDirectory + @"\Properties\AssemblyInfo.cs";

                if (Directory.Exists(myPropertiesDirectory) && File.Exists(myPropertiesLevelAssemblyInfo))
                {
                    myReturn = myPropertiesLevelAssemblyInfo;
                }
                else if (Directory.Exists(myParentDirectory) && File.Exists(myParentLevelAssemblyInfo))
                {
                    myReturn = myParentLevelAssemblyInfo;
                }
            }

            return myReturn;
        }

        #endregion

        #region CodeActivity Members

        protected override void Execute(CodeActivityContext context)
        {
            int myMajor = context.GetValue(this.Major);
            int myMinor = context.GetValue(this.Minor);
            int myBuild = context.GetValue(this.Build);
            Workspace myWorkspace = context.GetValue(this.Workspace);

            IList<string> myAssemblyInfos = GetRelevantAssemblyInfos(myWorkspace).Distinct().ToList();

            if (myAssemblyInfos.Any())
            {
                CheckOut(myWorkspace, myAssemblyInfos);
                UpdateAssemblyInfo(myAssemblyInfos, myMajor, myMinor, myBuild);
            }
        }

        #endregion
    }
}