As requested a sampler file as generated by the http proxy recorder - viewstates and ids are different from my other examples as I have recorded a number of times! Still get the same problem.
execute.jmx (text/plain), 4.61 KB, created by Liz Gold on 2012-01-20 16:21:38 UTC
Creator: Liz Gold
Created: 2012-01-20 16:21:38 UTC
Size: 4.61 KB
Actions: View
Attachments on bug 52491: 28180 | 28181