I wasn't sure if I should posted this in the forums or gallery module forums but I believe the source of the problem is from the gallery module. When users try to change their avatars in the forums, the following error occurs. (if I should post this in the "forums module" forums, let me know).

Server Error in '/' Application.
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Argument 'Length' must be greater or equal to zero.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: Argument 'Length' must be greater or equal to zero.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[ArgumentException: Argument 'Length' must be greater or equal to zero.]
   Microsoft.VisualBasic.Strings.Left(String str, Int32 Length) +149751
   DotNetNuke.Modules.Gallery.GalleryFolder.Populate() +4076
   DotNetNuke.Modules.Gallery.Utils.PopulateAllFolders(GalleryFolder rootFolder) +39
   DotNetNuke.Modules.Gallery.Config..ctor(Int32 ModuleID) +5320
   DotNetNuke.Modules.Gallery.Config.GetGalleryConfig(Int32 ModuleID) +74
   DotNetNuke.Modules.Forum.Integration.GalleryAddFile.Page_Load(Object sender, EventArgs e) +113
   System.Web.UI.Control.OnLoad(EventArgs e) +99
   System.Web.UI.Control.LoadRecursive() +47
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1061
 

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Version Information: Microsoft .NET Framework Version:2.0.50727.832; ASP.NET Version:2.0.50727.832