u can reproduce the bug in this way:

1) Go with ie9 (maybe with ie10 too) here: trirand.com/blog/jqgrid/jqgrid.html

2) select manipulating – grid data – and open the search dialog

3) open developer tools – network – start capture

4) search for: tax equal 120.00 and click "find" – in dev tools in the url you can see that the param "searchString" is empty, and the result grid of course is wrong.

5) click "find" another time – now the param "searchString" is ok!

Can i have a workaround to solve the issue while you will fix the bug?

thanks a lot