Just looking at this some more. We have changed over to using DnnComboxBox because this allows multi-slect categories that people have been asking for for years. However by default, the underlying RadComboBox sets the width to 160px if you don't set on the control. I need to investigate more....

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OK, I changed the width to 300px and all was well with the categories displaying on one line.

However, when trying to access Edit Settings I got the following error:

A critical error has occurred. Object reference not set to an instance of an object.

This is the error from the Event Viewer:

AssemblyVersion: 6.1.5
PortalID: 1
PortalName: UK & Ireland
UserID: 1
UserName: host
ActiveTabID: 116
ActiveTabName: Calendar
RawURL: /uki/Calendar/tabid/116/ctl/EventSettings/mid/769/Default.aspx?ContainerSrc=%5BG%5DContainers/InGrey/Container%201
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer: http://www.xxxxxxxxxx.net/uki/Calendar.aspx
UserAgent: Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20100101 Firefox/12.0
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: a4f78eb4-0f93-4020-a56c-c12ab4dd6131
InnerException: Object reference not set to an instance of an object.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: DotNetNuke.Modules.Events.EventSettings.LoadSettings
StackTrace:
Message: DotNetNuke.Services.Exceptions.PageLoadException: Object reference not set to an instance of an object. ---> System.NullReferenceException: Object reference not set to an instance of an object. at DotNetNuke.Modules.Events.EventSettings.LoadSettings() at DotNetNuke.Modules.Events.EventSettings.Page_Load(Object sender, EventArgs e) at System.EventHandler.Invoke(Object sender, EventArgs e) at System.Web.UI.Control.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---
Source:
Server Name: cle02web12

Where do I go from here?

The site is a child site and still under development, so no hurry for an answer.