Problems with ext.edit_tab_ajax

We are using a modified version of ext.edit_tab_ajax. It worked perfectly in EE 1.6.0, but we realized that it has a problem in 1.6.3: If you choose to display more than 50 entries, it displays no results.

We had this problem with our modified extension and with the original one. We tried it in two different EE installs, with the same results.

Is anybody having the same problem? Is there a fix for this or a similar extension we can use?

Thank you.