I can confirm that your fixes work, and everything else appears to be working as it should.
The only other issue that I ran into was updating the scaled text property in the visio when sliding the time. However, this turns out to be caused by a small bug in Mayavi when using it with VTK version 5.10 (which is the what is currently installed by the procedure I posted).
It is (a little ironically) caused by them incorrectly checking the VTK version. The required patch can be found here
which is very easy to apply manually if you know what you are doing. However, I don't know the best way to incorporate this with the neuronvisio package you created which installs mayavi. The fix should now be in the mayavi trunk so you could probably point to that if you like, but that may cause other problems I suppose. The other alternative would be just to disable the text in visio when the vtk version is 5.10 (5.11 should work) until the next release of Mayavi since the time is already displayed in the main controls.
Great work again Michele. It is nice to be able to quickly browse the models on ModelDB, plot their morphologies and test them out. I have to say after my quick little dabble that a tool like this is pretty important because he morphologies in some of them look quite weird and for some of them the hoc code doesn't run. Maybe you need to incorporate a little ratings button on the side!