Following upgrade of site from 7.4.2 to 7.5.10, for all nodes except the home node, the back-end property 'Link to document' displays as:

"This document is published but its url would collide with content (error)"

The site front-end appears to behave as usual and the creation and publication of new content is not affected.

Root 'Culture and Hostnames' settings:

Culture : Inherit

Two domain / language settings:

10.100.0.132:92
en-us

10.100.0.132:9200
gd-GB

We have a custom IUrlProvider in place that allows redirection to external addresses based on a property value:

public class CnesExternalUrlProvider : IUrlProvider
{
    public string GetUrl(UmbracoContext umbracoContext, int id, Uri current, UrlProviderMode mode)
    {
        var node = umbracoContext.ContentCache.GetById(id);
        return (node != null && node.HasValue("externalRedirectURL")) 
            ? node.GetPropertyValue<string>("externalRedirectURL") 
            : null;
    }

    public IEnumerable<string> GetOtherUrls(UmbracoContext umbracoContext, int id, Uri current)
    {
        return Enumerable.Empty<string>();
    }
}

However, disabling this does not address the issue.

Everything works at 7.4.2, so what's the issue with 7.5.10?

Thanks,

A

Update: Tracked the problem down to umbracoUseDirectoryUrls being set to false in web.config. Setting this to true cleared the issue - does this imply that setting this flag to false is no longer valid?