Troubleshooting: Document stuck on 'Logging in...'

Troubleshooting.md

@@ -34,6 +34,7 @@ The above will mean the TOC is updated on each file save.
     * [Re-running application does nothing](#re-running-application-does-nothing)
     * [Last logged "Locale LC_ALL: ..."](#last-logged-quot-locale-lc_all-quot)
 * [Problems with Frontier Authentication](#problems-with-frontier-authentication)
+    * [App is stuck on 'Logging in...'](#app-is-stuck-on-39-logging-in-39)
     * [App repeatedly opens the Frontier authentication website](#app-repeatedly-opens-the-frontier-authentication-website)
     * [App does not open Frontier authentication website](#app-does-not-open-frontier-authentication-website)
     * [Error: Invalid Credentials](#error-invalid-credentials)
@@ -165,6 +166,24 @@ for 'Control Panel' in the Start Menu.  Alternatively.
 <!-- vim-markdown-toc -->
 # Problems with Frontier Authentication
 
+
+<!-- vim-markdown-toc Redcarpet -->
+
+<a name='app-is-stuck-on-39-logging-in-39'></a>
+
+<!-- vim-markdown-toc -->
+## App is stuck on 'Logging in...'
+If, despite completing the Authorisation flow on the Frontier 
+website this application is still showing 'Logging in ...' on the bottom status
+line then please [add to this bug report](https://github.com/EDCD/EDMarketConnector/issues/909),
+following [Reporting a problem](#reporting-a-problem) with regards to attaching
+log files.
+
+**On Windows**: You might be able to work around the problem by running EDMarketConnector.exe
+with the `--force-localserver-for-auth` command-line argument.  There is 
+(from 4.2.3) a .bat file `EDMarketConnector - localserver-auth.bat` to make 
+this easier.
+
 <!-- vim-markdown-toc Redcarpet -->
 
 <a name='app-repeatedly-opens-the-frontier-authentication-website'></a>