I am having the same issue.  I am unable to search and edit ANY user even after clearing the cache and restarting the application.  I NEED some sort of resolution.  The following is the error message I receive continuously.

AssemblyVersion:7.3.4

PortalID:0

PortalName:The Villages Woodworkers Club

UserID:2

UserName:HansZ

ActiveTabID:68

ActiveTabName:User Accounts

RawURL:/Admin/User-Accounts/filter/bu/filterproperty/Username/pagesize/50/currentpage/0

AbsoluteURL:/Default.aspx

AbsoluteURLReferrer:http://www.thevwc.org/Admin/User-Accounts/pagesize/20/filter/B

UserAgent:Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:41.0) Gecko/20100101 Firefox/41.0

DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke

ExceptionGUID:fa6617d4-00f7-4db9-82e5-d4c47dad0423

InnerException:Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.

FileName:

FileLineNumber:0

FileColumnNumber:0

Method:

StackTrace:

Message:

DotNetNuke.Services.Exceptions.PageLoadException: Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding. ---> System.Data.SqlClient.SqlException: Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding. ---> System.ComponentModel.Win32Exception: The wait operation timed out
   --- End of inner exception stack trace ---
   at System.Data.SqlClient.SqlConnection. (SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.SqlInternalConnection. (SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
   at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
   at System.Data.SqlClient.SqlDataReader.TryCloseInternal(Boolean closeReader)
   at System.Data.SqlClient.SqlDataReader.Close()
   at DotNetNuke.Common.Utilities.CBO.CreateObjectFromReader(Type objType, IDataReader dr, Boolean closeReader)
   at DotNetNuke.Common.Utilities.CBO.FillObject[TObject](IDataReader dr)
   at DotNetNuke.Common.Lists.ListController.GetListEntryInfo(Int32 entryId)
   at DotNetNuke.Entities.Users.UserProfile.get_Region()
   at ASP.desktopmodules_admin_security_users_ascx.__DataBinding__control22(Object sender, EventArgs e)
   at System.Web.UI.Control.OnDataBinding(EventArgs e)
   at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)
   at System.Web.UI.Control.DataBind()
   at System.Web.UI.Control.DataBindChildren()
   at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)
   at System.Web.UI.Control.DataBind()
   at System.Web.UI.Control.DataBindChildren()
   at System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding)
   at System.Web.UI.Control.DataBind()
   at Telerik.Web.UI.GridItem.SetupItem(Boolean dataBind, Object dataItem, GridColumn[] columns, ControlCollection rows)
   at Telerik.Web.UI.GridItemBuilder.InitializeItem(Int32 dataSourceIndex, String& nextItemHierarchicalIndex, Boolean& itemIsInEditMode)
   at Telerik.Web.UI.GridItemBuilder.CreateItems(GridGroupingContext group)
   at Telerik.Web.UI.GridTableView.CreateItems(IEnumerator enumerator, GridColumn[] columns, ControlCollection controls)
   at Telerik.Web.UI.GridTableView.CreateControlHierarchy(Boolean useDataSource)
   at Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource)
   at System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data)
   at System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data)
   at System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback)
   at System.Web.UI.WebControls.DataBoundControl.PerformSelect()
   at Telerik.Web.UI.GridTableView.PerformSelect()
   at System.Web.UI.WebControls.BaseDataBoundControl.DataBind()
   at Telerik.Web.UI.GridTableView.DataBind()
   at Telerik.Web.UI.RadGrid.DataBind()
   at Telerik.Web.UI.RadGrid.AutoDataBind(GridRebindReason rebindReason)
   at Telerik.Web.UI.RadGrid. (EventArgs e)
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   --- End of inner exception stack trace ---

Sebastian,

I have 1186 users in the Users table operating in Azure.  I am not sure how to activate members as it appears as if I cannot use the Manage Users features in DNN 7.3.4.