Hi
I think this problem may be related to issue #132
If I try to export as a png a Gantt containing an issue with a single quote, I get the following http 500 error:
Internal error
An error occurred on the page you were trying to access.
If you continue to experience problems please contact your Redmine administrator for assistance.
If you are the Redmine administrator, check your log files for details about the error.
While looking at the logs, I can see the following error :
convert-im6.q16: non-conforming drawing primitive definition '' @ error/draw.c/RenderMVGContent/4301.
If I remove the single quote from the issue, I can export the gantt as a PNG.