I upgraded to MW 1.8.2 over the weekend, and a previously working FCKeditor seems broken. The image browser is returning an 'ajax request error' message.

My $wgScriptPath = ""; hasn't changed. and my FCKConfig.mwScriptPath = "."; hasn't changed.

I have tried to figure out what is happening by turining on the debug in the fck_image.js and tracing the steps. I get a popup window with: 'RSD: wfSajaxSearchFCKeditor uri = /./index.php?action=ajax&rs=wfSajaxSearchImageFCKeditor&rsargs[]=abe/post = null'

If I paste this into the browser, it returns a blank page.

Any Ideas why this would be?

Is there something that changed in 1.8?