Looking at my DNN event log I see several of these errors about YAF when people try to use the search feature in YAF;

AssemblyVersion: 7.0.2

PortalID: -1

PortalName:

UserID: -1

UserName:

ActiveTabID: -1

ActiveTabName:

RawURL:

AbsoluteURL:

AbsoluteURLReferrer:

UserAgent:

DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke

ExceptionGUID: acb81cca-1005-4139-addb-532d1da52392

InnerException: Object reference not set to an instance of an object.

FileName:

FileLineNumber: 0

FileColumnNumber: 0

Method: YAF.DotNetNuke.<>c__DisplayClass7.b__1

StackTrace:

Message: System.NullReferenceException: Object reference not set to an instance of an object. at YAF.DotNetNuke.YafDnnController.<>c__DisplayClass7.b__1(String sNewMessage) at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext() at YAF.DotNetNuke.YafDnnController.GetSearchItems(ModuleInfo modInfo) at DotNetNuke.Services.Search.ModuleIndexer.GetSearchIndexItems(Int32PortalID)

I fixed this issue recently updated files are online since 02/07/2013 "Fixed Search Indexer when Module Title is not Set", simply download the files and extract the dlls and copy them to your bin folder.

P.S: i didn't forget about the avatar problem and the profile syncing. I almost have a solution for that but not much time to work on.