White page are indicative of two things.
A) An outdated version of php, if your host is running php4, upgrade to php5.2.xx or higher, if you can't do it yourself, ask your host to do it for you.
A php.ini memory limit that is too low. On many shared hosts, you are started with only 8MB, while the current requirement is 32MB, optimally 64MB, if you can't do it yourself, ask your host to do it for you.
Hundreds, if not thousand of user are currently using Affinity on compatible hosts.
99.9% of the time, it is not the template, or even Joomla that causes these type of problems, but inadequate hosting.
Current template version: 1.15.17
www.rockettheme.com/joomla-templates/affinity#changelog
Current Joomla version: 1.5.23
www.joomla.org/
No need for your transaction ID... basically, your membership has expired and this is not the place for template related questions...
www.rockettheme.com/forum/index.php?f=15&t=4239&rb_v=viewtopic
To answer / solve your issues is unfair to current members and non-current members that do not receive template specific support in this forum. (As a courtesy, I have provided some basic things to look for.)
JEM wrote:
Best course of action, renew or become a current member for the proper platform and post in the proper forum with the proper details...
which would be here:
www.rockettheme.com/forum/index.php?f=226&rb_v=viewforum
If the php version or memory limit are not the solution, then that is where you should post for further troubleshooting / support.