Your software environment is very similar to the environment that the demo is running in.
I don’t know why it should be an issue on your server, but I do think I’ve found the answer.
Please follow this advice, and let me know if it helps or not.
(On a side note you might consider upgrading your PHP to 5.6 which is what is recommended for osTicket. I don’t think it has anything to do with your SVG issue, but it could help to avoid other mysterious issues).