Thanks so much! that solved the problem, but we restarted the machine for a software update and now spark will not launch at all, I can see it open in the task manager processes and then it immediatly shuts down, the log in window never opens.
Try removing user’s Spark profile folder completely (you can save the history of chats and then copy it back, when new profile is generated). Also you can try 2.6.0 RC1 version http://www.igniterealtime.org/downloads/beta.jsp
If you have Kerberos running on your system and u auth with that and is using 2.5.8, spark will not launch if spark cannot finds it´s credentials for kerberos.
To solve use “klist purge” to remove all kerberos tickets and then use “kinit” -> enter users password, and authenticate the user again towards kerberos and spark should be running fine again, alt just reboot the computer after that.