diff --git a/src/Umbraco.Core/Persistence/Repositories/Implement/StylesheetRepository.cs b/src/Umbraco.Core/Persistence/Repositories/Implement/StylesheetRepository.cs
index 4c02a8f4b5..698a9f4364 100644
--- a/src/Umbraco.Core/Persistence/Repositories/Implement/StylesheetRepository.cs
+++ b/src/Umbraco.Core/Persistence/Repositories/Implement/StylesheetRepository.cs
@@ -25,8 +25,17 @@ namespace Umbraco.Core.Persistence.Repositories.Implement
 
             path = path.EnsureEndsWith(".css");
 
-            if (FileSystem.FileExists(path) == false)
+            // if the css directory is changed, references to the old path can still exist (ie in RTE config)
+            // these old references will throw an error, which breaks the RTE
+            // try-catch here makes the request fail silently, and allows RTE to load correctly
+            try
+            {
+                if (FileSystem.FileExists(path) == false)
+                    return null;
+            } catch
+            {
                 return null;
+            }
 
             // content will be lazy-loaded when required
             var created = FileSystem.GetCreated(path).UtcDateTime;
diff --git a/src/Umbraco.Tests/Persistence/Repositories/StylesheetRepositoryTest.cs b/src/Umbraco.Tests/Persistence/Repositories/StylesheetRepositoryTest.cs
index f427f22796..304422d1e2 100644
--- a/src/Umbraco.Tests/Persistence/Repositories/StylesheetRepositoryTest.cs
+++ b/src/Umbraco.Tests/Persistence/Repositories/StylesheetRepositoryTest.cs
@@ -294,15 +294,13 @@ namespace Umbraco.Tests.Persistence.Repositories
                 stylesheet = repository.Get("missing.css");
                 Assert.IsNull(stylesheet);
 
-                // fixed in 7.3 - 7.2.8 used to...
-                Assert.Throws<UnauthorizedAccessException>(() =>
-                {
-                    stylesheet = repository.Get("\\test-path-4.css"); // outside the filesystem, does not exist
-                });
-                Assert.Throws<UnauthorizedAccessException>(() =>
-                {
-                    stylesheet = repository.Get("../packages.config"); // outside the filesystem, exists
-                });
+                // #7713 changes behaviour to return null when outside the filesystem
+                // to accomodate changing the CSS path and not flooding the backoffice with errors
+                stylesheet = repository.Get("\\test-path-4.css"); // outside the filesystem, does not exist
+                Assert.IsNull(stylesheet);
+
+                stylesheet = repository.Get("../packages.config"); // outside the filesystem, exists
+                Assert.IsNull(stylesheet);                
             }
         }
 
diff --git a/src/Umbraco.Web.UI.Client/src/views/propertyeditors/rte/rte.prevalues.controller.js b/src/Umbraco.Web.UI.Client/src/views/propertyeditors/rte/rte.prevalues.controller.js
index 41097f9e9a..47b0215dac 100644
--- a/src/Umbraco.Web.UI.Client/src/views/propertyeditors/rte/rte.prevalues.controller.js
+++ b/src/Umbraco.Web.UI.Client/src/views/propertyeditors/rte/rte.prevalues.controller.js
@@ -39,8 +39,14 @@ angular.module("umbraco").controller("Umbraco.PrevalueEditors.RteController",
 
         stylesheetResource.getAll().then(function(stylesheets){
             $scope.stylesheets = stylesheets;
-
-            _.each($scope.stylesheets, function (stylesheet) {
+            
+            // if the CSS directory changes, previously assigned stylesheets are retained, but will not be visible
+            // and will throw a 404 when loading the RTE. Remove them here. Still needs to be saved...
+            let cssPath = Umbraco.Sys.ServerVariables.umbracoSettings.cssPath;
+            $scope.model.value.stylesheets = $scope.model.value.stylesheets
+                .filter(sheet => sheet.startsWith(cssPath));
+            
+            $scope.stylesheets.forEach(stylesheet => {
                 // support both current format (full stylesheet path) and legacy format (stylesheet name only) 
                 stylesheet.selected = $scope.model.value.stylesheets.indexOf(stylesheet.path) >= 0 ||$scope.model.value.stylesheets.indexOf(stylesheet.name) >= 0;
             });