ah yes, you are putting the number of records in the group header text. Assuming it's working for you since your title now says [SOLVED]. I dropped in your groupTextTpl and it worked for me...although it may be a bit funny depending on what your data and grouping is actually setup to be.
In other news:
I've been working on better indention for multi-grouping, so as to give a tree-like hierarchy to a flat grid view. It's working fairly well, the only "issue" is that since the data is still flat, nested groups get cut off by the paging limits. It's not a true nested grid view, like the TreeGrid plugin or Ext 4's TreeGrid, so each inner grid doesn't ajax load as expanded. But it gives a nice visual appearance to hierarchical flat data none-the-less.