We don't provide service. We provide help, for free.
In this very case, the help we provide is to tell you to switch to a more recent version, to check if the problem still occurs, and then to fill a JIRA with a compete description of your problem, configuration used, and eventually everything necessary to reproduce the problem. If so, we will be pleased to provide a patch, but unless you do that, our limited time does not let us spend some energy on a more than one year release version, with a problem very likely to have been solved since then (since we released 1.5.5, we have injected more than 5000 code modifications).
If you feel like getting some real service, get ready to pay load of money for it. As we don't accept money here, we just provide a 'best effort', and again, it's 'go upgrade and come back'.
You can also debug the code, provide the patch, and eventually see it being injected in a branch.
Participate, stop whining !