Hello,
After updating JIRA to version 5.1.5 and Gantt-Chart Plugin to version 2.1.3 all tasks displayed on chart are duplicated. Additional thing I did notify is that all Versions has underscores "_" instead of white space character " ". Same goes for tickets titles. Screenshot can be downloaded here http://wtrns.fr/gnLYnoi93gM-ON
I'm getting WARN message in logs but I don't think this is an issue as I saw it with earlier version and everything was working properly.
2012-09-24 13:17:06,188 http-8080-1 WARN marek.tuchalski 797x722x2 1t35lfq 213.17.170.58 /plugins/servlet/gantt-issues [jira.plugins.servlet.GanttServlet] Greenhopper seems to be de-installed!
Please let me know if you need more data. I will happily provide more info if needed.
Thanks in adance,
Marek