diff --git a/Troubleshooting.md b/Troubleshooting.md
index d2afff2..eb7bfb2 100644
--- a/Troubleshooting.md
+++ b/Troubleshooting.md
@@ -45,6 +45,7 @@ Then to add it back :GenTocRedCarpet
     * [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)
+    * [Error: customer_id doesn't match!](#error-customer_id-doesn-39-t-match)
     * [Error: An error occured](#error-an-error-occured)
     * [500 internal server error](#500-internal-server-error)
     * [Error: User not found](#error-user-not-found)
@@ -61,7 +62,7 @@ Then to add it back :GenTocRedCarpet
     * [Error: Unable to get token](#error-unable-to-get-token)
     * [I'm using BitDefender and things don't work](#i-39-m-using-bitdefender-and-things-don-39-t-work)
 * [Miscellaneous](#miscellaneous)
-    * [Scaling doesnt work on linux](#scaling-broken-linux)
+    * [Scaling does not work on linux](#scaling-does-not-work-on-linux)
     * [Program doesn't send data to EDSM and others at startup](#program-doesn-39-t-send-data-to-edsm-and-others-at-startup)
     * [Doesn't auto-update and/or persistently gives “Server is lagging” error](#doesn-39-t-auto-update-and-or-persistently-gives-“server-is-lagging”-error)
     * [I forgot to run the app - is there a way to process the missing data?](#i-forgot-to-run-the-app-is-there-a-way-to-process-the-missing-data)
@@ -73,6 +74,7 @@ Then to add it back :GenTocRedCarpet
     * [EDMarketConnector needs permission to use shortcuts](#edmarketconnector-needs-permission-to-use-shortcuts)
 * [Multi-Accounting](#multi-accounting)
     * [I run two instances of E:D simultaneously, but I can't run two instances of EDMC](#i-run-two-instances-of-e-d-simultaneously-but-i-can-39-t-run-two-instances-of-edmc)
+        * [Linux](#linux)
     * [Error: Wrong Cmdr](#error-wrong-cmdr)
 
 <!-- vim-markdown-toc -->
@@ -319,6 +321,17 @@ See [above](#app-repeatedly-opens-the-frontier-authentication-website).
 
 <!-- vim-markdown-toc Redcarpet -->
 
+<a name='error-customer_id-doesn-39-t-match'></a>
+
+<!-- vim-markdown-toc -->
+## Error: customer_id doesn't match!
+The returned Frontier Authorisation token contains a different customer ID 
+to what the application expected for the current Commander.  If you have more
+than one account/Commander check you used the correct credentials, matching 
+the Commander as shown in the main UI.
+
+<!-- vim-markdown-toc Redcarpet -->
+
 <a name='error-an-error-occured'></a>
 
 <!-- vim-markdown-toc -->
@@ -503,6 +516,11 @@ To fix this you need to add it as an exception in BitDefender by going to :
 
 <a name='scaling-broken-linux'></a>
 
+<!-- vim-markdown-toc Redcarpet -->
+
+<a name='scaling-does-not-work-on-linux'></a>
+
+<!-- vim-markdown-toc -->
 ## Scaling does not work on linux
 
 On some linux distributions, the default font is not a font that can be scaled by our UI.
@@ -729,6 +747,11 @@ This application doesn't support running two instances of the Game in the *same*
 user account. The application will only respond to the instance of the Game that 
 you ran last, because its Journal file will then be the most recent.
 
+<!-- vim-markdown-toc Redcarpet -->
+
+<a name='linux'></a>
+
+<!-- vim-markdown-toc -->
 ### Linux
 EDMC respects `XDG_DATA_HOME` and `XDG_CONFIG_HOME` for its plugin and config dirs.
 Running multiple instances of EDMC simply requires that you change the two environment