Just guessing, but there was a similar problem (crash, sometimes hang) with the default theme (bug 362225), maybe the Noia theme need to do a similar workaround as in bug 332160 last patch...
Does it still hang if you turn off notification on new mail?
Just guessing, but there was a similar problem (crash, sometimes hang) with the default theme (bug 362225), maybe the Noia theme need to do a similar workaround as in bug 332160 last patch...
Does it still hang if you turn off notification on new mail?