Ok, the problem is that the mesh is scaled (you should avoid scaling, especially for character rigs). To fix it:
1. Switch to pro-mode, select your mesh
2. Do Animate->Envelope->Reset Actor
3. Open an Explorer view
4. Under the PlayerMesh, open the Clusters->EnvelopWeightCls->Envelope_Weights property page
5. Save a preset called temp (on the property page, there is a very small folder icon, click on it to open up the save/load menu)
6. Select the mesh again and do Animate->Envelope->Remove Envelope
7. Go in Transform->Freeze Scaling, the scaling of the mesh should now be 1,1,1
8. Set the envelope back (Animate->Envelope->Set Envelope)
9. Close all opened property pages. Open the Explorer view. Under the PlayerMesh, open the Clusters->EnvelopWeightCls->Envelope_Weights property page
10. Load the preset called temp
it should now work fine (it did when I tried it anyway :-))