Problem with 5.2--Preview for Page Lists no longer works
Already tried re-uploading the files. Same thing happens on my local test machine.
Were you able to fix the problem? I noticed the Preview in my AutoNav block stopped working after upgrading to 5.2.1 as well...
The problem occurs when having custom templates in blocks, for auto-nav and page-lists.
When you delete these files, it works again. Upload the files again and the problem is back.
This way the dynamic AJAX updates to the modal window works again.