Problem with HTML box in module editing - Joomla! Forum - community, help and support

for odd reason when try open html editing box when trying edit or create module, in firefox load blank white box nothing in it, , in ie wont load @ all.. here picture of mean..

http://www.pigskinplanet.com/moduleproblem.jpg

^^ thats happens when click html button in module editor.

does have idea causing this? need able edit html in modules problem me. possible have accidentally changed sort of permission setting or that, or there sort of error instalation of joomla? know it's not browser because tried ie , ff , neither work.

my website http://pigskinplanet.com btw

thanks in advance help.

editors have problems if not access site via exact url in configuration.php

i notice link site without http://www.  ( although later )

and in admin screenshot using www.pigskinplanet

make sure when editing, access site exact site url per mosconfiglivesite url in configuration.php