I tried it with the jQuery Edge version and it still repro's.
Here is a link to a repro on JSFiddle:
You need to run it including the "/show/" part of the URL because trying to run within JSFiddle raises errors.
1) click on the rows in the table and see that the Values under the heading "Results" are updated with what is in the clicked on row.
2) click one of the red or green div's that contain random test numbers and say "click for details"; it will reload the same page in a "popup" div.
3) click on the 'X' in the "popup" div to close it.
4) click on the rows in the table again and you will see that they no longer update the Values under the heading "Results".
I have narrowed down the problem further while attempting to build a repro on JSFiddle. The problem with calling .load (or $.get) only occurs for me when loading a full page that contains script tags etc. If, in addition to the URL, I provide a filter to select some sub element from the results, or I load partial markup which does not contain a head with script tags, then there is no problem.
The problem only occurs when loading a full page with script tags and not doing a subselect against its content.