Predefined trust level policies are Extensible Markup Language (XML) files that give details on the various security settings. To run Subtext v1.9 at medium trust, you can create a customized policy by modifying the existing predefined medium trust policy to include permissions for webservices. Because there is a risk associated with enabling WebPermission, it is not enabled by default. 
With this approach, you do the following:

When your blog is having technical issues it often helps to look at a log of errors. This is especially true when using a remote shared host that you have limited access to.

If you are using Subtext at WebHost4Life and you would like to enable the Gallery on your blog so you can upload images, here are the steps.