I have the same problem - html module does not save any update. Upgraded from 5.6.1 to 6.1.1
On upgrade it looked like everythng worked but when I looked closer, I had the following DNNCE_HTML error.

00:00:29.249 - Installing Optional Modules:
00:00:29.267 - Installing Package File DDRMenu_02.00.01_Install: Success
00:00:30.863 - Installing Package File DNNCE_HTML_06.01.01_Install: Error!
00:00:32.437 - Installing Package File DNNCE_Messaging_06.01.01_Install: Success
00:00:33.008 - Installing Package File DNNCE_Taxonomy_06.01.01_Install: Success
00:00:33.540 - Installing Package File Telerik_06.01.00_Install: Success

Anyone know how to correct this - Tried all 3 editors, none worked and the module won't save any upates in Basic Editor either.

Thanks,

John K

Thank you Sebastian,
Same result: Here's the screen grab.

00:00:00.023 - Installing Optional Modules:
00:00:00.077 - Installing Package File DDRMenu_02.00.01_Install: Success
00:00:03.499 - Installing Package File DNNCE_HTML_06.01.01_Install: Error!
00:00:07.742 - Installing Package File DNNCE_Messaging_06.01.01_Install: Success
00:00:09.036 - Installing Package File DNNCE_Taxonomy_06.01.01_Install: Success
00:00:09.819 - Installing Package File Telerik_06.01.00_Install: Success

Here's the Stack Trace:
StackTrace:
Message: System.ArgumentException: Parameter count does not match Parameter Value count. at Microsoft.ApplicationBlocks.Data.SqlHelper.AssignParameterValues(SqlParameter[] commandParameters, Object[] parameterValues) at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteScalar(String connectionString, String spName, Object[] parameterValues) at DotNetNuke.Modules.Html.SqlDataProvider.AddHtmlText(Int32 ModuleID, String Content, Int32 StateID, Boolean IsPublished, Int32 CreatedByUserID, Int32 History) at DotNetNuke.Modules.Html.HtmlTextController.UpdateHtmlText(HtmlTextInfo htmlContent, Int32 MaximumVersionHistory) at DotNetNuke.Modules.Html.EditHtml.cmdSave_Click(Object sender, EventArgs e)

When I browse to "/install/install.aspx?mode=upgrade" it results in just a blank screen.
There are only two log.resources files prior to the upgrade date - both are 0 KB.
The log.resources file from the upgrade date has this error repeated many times - may have nothing to do with it.

2011-11-23 17:28:16,479 [------][Thread:8][ERROR] DotNetNuke.Services.Log.EventLog.LogController - A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: SSL Provider, error: 0 - The handle specified is invalid)
System.Data.SqlClient.SqlException: A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: SSL Provider, error: 0 - The handle specified is invalid)


Do you think installing a different html editor would solve this problem?
Do I have to reinstall the DNN Instance?
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Thanks for taking the time to help a DNN novice.
John K