There might be a problem in Umbraco 7.5.6 version. Upgrading to Umbraco 7.5.7 and background image is OK.

I too am having this issue, even after upgrading to 7.57

Hello, I'm having the same issue and I've upgrade from 7.5.6 to 7.5.7 and it's still not rendering the background-image attribute correctly. It's removing brackets and single quotes from the modifier:

"modifier": "url('{0}')"

Hi

I am also experiencing this issue. Anyone found out the issue?

I found the solution to the problem. It ended up being the code on the Bootstrap 3 grid under the Partial Views section. For some reason the update didn't fix the problem for me, but once I changed to the code I'm pasting below, the problem was solved.

@inherits UmbracoViewPage<dynamic>
    @using Umbraco.Web.Templates
    @using Newtonsoft.Json.Linq

    @* 
        Razor helpers located at the bottom of this file
    *@

    @if (Model != null && Model.sections != null)
    {
    var oneColumn = ((System.Collections.ICollection)Model.sections).Count == 1;

    <div class="umb-grid">
        @if (oneColumn)
        {
            foreach (var section in Model.sections) {
                <div class="grid-section">
                    @foreach (var row in section.rows) {
                        @renderRow(row, true);
                    }
                </div>
            }   
        }else { 
            <div class="container">
                <div class="row clearfix">
                    @foreach (var s in Model.sections) {
                        <div class="grid-section">
                            <div class="col-md-@s.grid column">
                                @foreach (var row in s.rows) {
                                    @renderRow(row, false);
                                }
                            </div>
                        </div>
                    }
                </div>
            </div>   
        }
    </div>
}

@helper renderRow(dynamic row, bool singleColumn){
    <div @RenderElementAttributes(row)>
        @Umbraco.If(singleColumn, "<div class='container'>")
        <div class="row clearfix">
            @foreach ( var area in row.areas ) {
            <div class="col-md-@area.grid column">
                <div @RenderElementAttributes(area)>
                    @foreach (var control in area.controls) {
                        if (control !=null && control.editor != null && control.editor.view != null ) {
                            <text>@Html.Partial("grid/editors/base", (object)control)</text>
                        }
                    }
                </div>
            </div>}
        </div>
        @Umbraco.If(singleColumn, "</div>")
    </div>
}

@functions {
    public static MvcHtmlString RenderElementAttributes(dynamic contentItem)
    {
        var attrs = new List<string>();
        JObject cfg = contentItem.config;

        if(cfg != null)
            foreach (JProperty property in cfg.Properties())
            {
                var propertyValue = HttpUtility.HtmlAttributeEncode(property.Value.ToString());
                attrs.Add(property.Name + "=\"" + propertyValue + "\"");
            }

        JObject style = contentItem.styles;

        if (style != null) {
            var cssVals = new List<string>();
            foreach (JProperty property in style.Properties())
            {
                var propertyValue = property.Value.ToString();
                if (string.IsNullOrWhiteSpace(propertyValue) == false)
                {
                    cssVals.Add(property.Name + ":" + propertyValue + ";");
                }
            }

            if (cssVals.Any())
                attrs.Add("style=\"" + HttpUtility.HtmlAttributeEncode(string.Join(" ", cssVals)) + "\"");
        }

        return new MvcHtmlString(string.Join(" ", attrs));
    }
}

Thanks.

Removing: TemplateUtilities.CleanForXss() resolves it. However this is a bug and should be reported in if its not fixed in the latest version. Running 7.5.6 now.

Seems to be fixed in 7.5.7 and above

http://issues.umbraco.org/issue/U4-9262

is working on a reply...