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How to resolve problem of "error on page" -so to save new or edited material?

I activated the quick and automatic installation of JOOMLA on GODADDY and all worked well until 3 days ago. Presently I cannot edit, add, cancel or save anything.
I have done the System > Global Checkin which corrected the "locked out" item but am still not able to save or cancel any category or content. As soon as I try to type data in the required editor box I get a "Done but error on page" message. Why?

I had the same problem. IE 7 was the culprit. FireFox works just fine.  Don't know why.

dc41 wrote:I had the same problem. IE 7 was the culprit. FireFox works just fine.  Don't know why.

Thanks for FireFox tips. You saved me a lot of trouble. I installed the lastest version (2) of Firefox and can now edit and same articles using the editor. However there are still item in the editor that do not work in this particular installation which works fine in other installations of JOOMLA I have. For instance, the "Insert Image" button does not work properly . . . do you or someone else have a solution for that?

Thanks again.