jQuery Grid Plugin - jqGrid

Hi,

I have a 440 row dataset, with 4 levels and somehow the treegrid is  being created with the first level 0 and level 1 and level 3 nodes expanded (not level2), even though all rows are returned expanded = "false".

There are 373 rows in the first node in 4 levels, the remaining 70 nodes in the other 3 top level nodes.

When I try and collapse/expand the first few the wrong nodes expand/collapse and I often get a "too much recursion" error from jquery.min.js) line 30. 

Is the recursion from too much data or too many levels or some linkage error in my data. I've looked pretty closely at the JSON  and it looks right, but...

I'm happy to load the dataset if anyone has any ideas.

Thanks

Martin