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Did you see any issues in the YAF Event log?
Did you disabled hot linking on your server?
I'm seeing this:
Error while Syncing dnn userprofile with Yaf
System.NullReferenceException: Object reference not set to an instance of an object.
at DotNetNuke.Common.Utilities.UrlUtils.EncryptParameter(String value, String encryptionKey)
at YAF.DotNetNuke.Components.Utils.ProfileSyncronizer.SaveDnnAvatar(String fileId, Int32 yafUserId, Guid portalGUID, YafBoardSettings boardSettings)
at YAF.DotNetNuke.Components.Utils.ProfileSyncronizer.SyncYafProfile(Int32 yafUserId, YafUserProfile yafUserProfile, IUserData yafUserData, UserInfo dnnUserInfo, Guid portalGUID, YafBoardSettings boardSettings)
at YAF.DotNetNuke.Components.Utils.ProfileSyncronizer.UpdateUserProfile(Int32 yafUserId, YafUserProfile yafUserProfile, IUserData yafCurrentUserData, UserInfo dnnUserInfo, MembershipUser membershipUser, Int32 portalID, Guid portalGuid, YafBoardSettings boardSettings, Boolean ignoreLastUpdated)
And also this:
Error In UserCleanUpTask Task
System.Threading.ThreadAbortException: Thread was being aborted.
at System.Threading.Thread.SleepInternal(Int32 millisecondsTimeout)
at System.Threading.Thread.Sleep(Int32 millisecondsTimeout)
at YAF.Core.Tasks.UserCleanUpTask.RunOnce()
Also, not sure what you mean about hot linking? Is it a particular DNN or YAF option?