>Easiest thing - why did you upgrade? Do you need some new feature/bugfix of jQuery? If not, go back to the old version.
>
>To debug this, I'd open the site up in Chrome and select a row. Then I'd go into Elements and click on the magnifying glass icon (small icon at the bottom) and select the row that is highlighted. In the source I'd make sure that they're still attaching the class of "trSelected" to the selected rows. If that looked good, I'd then click on the Console menu option and attempt to view difference references / run your code:
>
>

>$('#flexClients')   (then hit Enter - is a bit of HTML returned? If not, you've got the wrong reference)
>
>$('.trSelected', $('#flexClients')).each(function() { alert('Id is: ' + $(this).attr('id')) })  (then hit enter, it should display the selected row ID)
>

The above seemed to work fine after the initial click on the row in development. See attached