Existing Citrix Gateway RfWebUI based custom themes or nFactor with custom themes  are not working after upgrading to 13.0-47.22 and 13.0-47.24 builds.
Newly created and non-RfWebUI based custom themes will not have any issue.

Permanent Fix

To resolve this issue upgrade to 13.0 52.24 or later builds. 

Workaround

Follow any one of the below workarounds to fix this issue.

Workaround 1

Run the following two commands for each of the RfWebUI based custom themes. 

• ln –s /var/netscaler/logon/LogonPoint/index.html /var/netscaler/logon/themes/<CustomThemeName >/index.html
• ln –s /var/netscaler/logon/LogonPoint/tmindex.html /var/netscaler/logon/themes/<CustomThemeName >/tmindex.html

Workaround 2

If there are many custom themes, following script can be run so that all the custom themes will be fixed in one go. Copy the script on to Citrix ADC and run it using the following command

• shell# python fix_RfWebUI_CustomThemes.py