I'm getting the following (as well as a 500 internal server error in the console) when I try to publish or save a post:

Server Error in '/' Application.

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Object reference not set to an instance of an object.

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

Source Error: 

Stack Trace: 

[NullReferenceException: Object reference not set to an instance of an object.]
   uTagsy.Web.usercontrols.uTagsy.uTagsy.SaveSettings() in D:\_PROJECTS\Personal\uTagsy\Source\uTagsy.Web\usercontrols\uTagsy\uTagsy.ascx.cs:128
   uTagsy.Web.usercontrols.uTagsy.uTagsy.OnLoad(EventArgs e) in D:\_PROJECTS\Personal\uTagsy\Source\uTagsy.Web\usercontrols\uTagsy\uTagsy.ascx.cs:37
   System.Web.UI.Control.LoadRecursive() +54
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Control.LoadRecursive() +145
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.19067

I've read all of the posts on this, but emptying out the uTagsy settings.json file and setting permissions for the folders to be read/write hasn't fixed this issue for me. Here are the versions I'm using:

uBlogsy: 3.0.1
Umbraco: 6.1.1

I've also tried to re-install uBlogsy, but that didn't help either. I do have an odd quirk when I install uBlogsy that might give a clue: It throws a "Specified cast is not valid" error screen after I instal uBlogsy and complains about something in uDateFoldersy. I was going to install the hotfix, but it's showing the 3.0.1 dll as a later version, so I didn't replace it.

Any ideas what might be going on or what a possible fix might be?