Background:
I have a set of Capybara integration tests running against my Rails 3 Application. For the other parts of the test suite I
For IE webdrive you can run at most 1 test on one physical node! If you want to achieve parallelism with IE webdriver than you can try by add/register more physical node to the hub.
Regarding above screen shot of hub console, it also shows you only one IE icon. The message is wrong that "Supports up to 5 ...." but you can consider number of icon for respective browser displayed below it.
Here you have to fire the same tests for different browser so can try to start two process of tests i.e. Run the same command twice.
As you have started the nodes the Grid will handle the execution on different nodes.
In your case you are executing the test and only on suite/process is started with respect to Grid. Just for testing Purpose try firing these tests twice one after another. If you are not able to Achieve by this Use Ant or similar thing to control your execution of tests.