Can you provide your ACC client/server version, also has there been any recent upgrades? was this working before and all of a sudden stopped working? can you try installing the client console on a different machine and see if it works? is this a hosted or on-premise installation?
Try hard clearing the cache by:
https://helpx.adobe.com/ie/campaign/kb/how-to-perform-soft-and-hard-cache-clear-when-the-issues-are-mac.html
On the client console, choose File > Clear the local cache.
Logout and close the client console (rich client).
Go to the following locations, based on your operating system version:
- Windows 7: C:\Users\<Username>\AppData\Roaming\Neolane\NL_5\
- Windows XP: C:\Documents and Settings\<Username>\Application Data\Neolane\NL_5
Here you will see many xml files named nlclient-config-<alphanumerical value>.xml.
Delete these xml files and associated folders.
Caution:
Do not delete nlclient_cnx.xml file.
Sign in to client console.
