edit page does not load but progress message says "done"
 

I have a recurring problem in that periodically when I try to edit a page on my Atahualpa site, the edit page does not download completely and I am not able to edit the page. the message at the bottom of the page states that the process is "done" but the edit area is blank. I have no idea why this is happening but it puts a stop to any progress I am making in the creation of my website which is a commerce site for the sale of my fine art prints. (www.SeaIslandPrints.com). Can someone tell me what I am doing wrong so that I can continue with the website construction and publish it to the web? I encountered this problem a month ago and stopped working on the site for a week and when I returned, the edit page returned also. Now it has disappeared again. Please email me any answers or suggestions as well as placing them on this thread as I may miss them on the thread. seaislandman@islc.net All help is greatly appreciated.