camel_imap_message_cache_new has this code:

    GError *error;

    dir = g_dir_open (path, 0, &error);

This leads to:
(evolution-2.8:3091): GLib-WARNING **: GError set over the top of a previous GError or uninitialized memory.
This indicates a bug in someone's code. You must ensure an error is NULL before it's set.

and a segfault shortly after.

Suggest that the line be rewritten to 
    GError *error = NULL;

This is with:
  evolution-data-server-1.7.4-3
  evolution-2.7.4-3
on Fedora pre-6 development