mod_fcgid problems w/ IE?

I have a RoR application running under Apache2 w/ mod_fcgid

Whenever I submit a large number of database updates asynchronously from IE, I notice that 10-12 fcgi processes (dispatch.fcgi) are spawned. Eventually the server issues a "Rails application failed to start properly" error and sends it back to the browser (which is expecting XML). I'm guessing that it's wanting to spawn another fcgi process and cannot.

When I run exactly the same operation in firefox (from a unix box or PC) only 2 or 3 fcgi processes are spawned and the operation completes without error.

Does anyone know what's going on?

Thanks, Peter