I have installed the Widgetkit module to joomla 2.5 and it is working, however when I try to make a slideshow the html editor does not appear to actually add content to the slideshow, I have a html editor enabled on global configuration (TinyMCE) also tried another editor but still no joy. Any ideas why this is happening?
Try to use JCE.
If it's still not working then go to JCE preferences and change there editor appearing in different places of admin panel.