I've just upgraded DNN from 7.4.0 to 7.4.2 and also upgraded DMX from 6.1.11 to 6.1.12 and can see the FlexList/Tree view of folders fine, but the Document Repository/Explorer View is now stating:

Error loading Bring2mind/DMX/Views/AjaxTwoPanel.ascx DotNetNuke.Services.Exceptions.ModuleLoadException: C:\Inetpub\vhosts\vashonbeprepared.org\httpdocs\DesktopModules\Bring2mind\DMX\Views\AjaxTwoPanel.ascx(14): error BC32206: The project currently contains references to more than one version of ComponentArt.Web.UI, a direct reference to version 2010.1.2193.3 and an indirect reference (through 'Bring2mind.DNN.Modules.DMX.Views.AjaxTwoPanel.Grid1') to version 2012.1.1016.35. Change the direct reference to use version 2012.1.1016.35 (or higher) of ComponentArt.Web.UI. ---> System.Web.HttpCompileException: C:\Inetpub\vhosts\vashonbeprepared.org\httpdocs\DesktopModules\Bring2mind\DMX\Views\AjaxTwoPanel.ascx(14): error BC32206: The project currently contains references to more than one version of ComponentArt.Web.UI, a direct reference to version 2010.1.2193.3 and an indirect reference (through 'Bring2mind.DNN.Modules.DMX.Views.AjaxTwoPanel.Grid1') to version 2012.1.1016.35. Change the direct reference to use version 2012.1.1016.35 (or higher) of ComponentArt.Web.UI. at System.Web.Compilation.BuildManager.CompileWebFile(VirtualPath virtualPath) at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate) at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate) at System.Web.UI.TemplateControl.LoadControl(VirtualPath virtualPath) at System.Web.UI.TemplateControl.LoadControl(String virtualPath) at Bring2mind.DNN.Modules.DMX.Dispatch.ᜀ(Object A_0, EventArgs A_1) --- End of inner exception stack trace ---

I have been getting a number of exceptions that I've not chased down yet, but believe this is a new issue.

How do I resolve the duplicate references to ComponentArt.Web.UI?

Thanks Peter!

Searching, I see I have ComponentArt.Web.UI version 2010.1.2193.3 in the wwwroot/myDnn/bin directory. I'll try just renaming it out of the way?

Nope, that got me a 500 Internal Server Error. I was able to achieve success by manually FTP'ing the current DLL included in your install script to the DNN bin directory. Not sure why the install didn't handle that in my case but things appear fine now - on first blush.