The default sessionfailure message reads:
'There seems to be a problem with your login session;
this action has been canceled as a precaution against session hijacking.
Please hit "back" and reload the page you came from, then try again.',
This is not a super great suggestion -- hitting 'back' and/or reloading will in some browsers lose your form state, so you've now lost all your work and have to start over.
In most cases, the correct fix is actually to more like *hit the submit button again*, since the rest of your form state will be preserved... possibly going to login and preview beforehand, though.
Generally this kind of sucks.
Version: unspecified
Severity: enhancement