Cannot edit Custom HTML or Articles following upgrade to J 3 - Joomla! Forum - community, help and support

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i updated joomla 2.5 3.4 , displays fine in front end. however, can no longer edit articles or custom html modules.

when clicking on respective custom html module, screen displays text on white background: "title *" , *custom html, site, module..." , nothing else. see link below:

image

i have tried:
- purging cache on both joomla , browser
- trying edit different browser , computer
- switching both front-end , back-end templates
- resetting global default editor , user default editors every possible permutation while disabling plug-ins respective editors
- reinstalling jce editor

all of above ideas taken various threads, nothing seems work. tearing hair out @ end!

any appreciated!

check extensions manger tab warnings , database errors/messages.

install admin tools core , fix permissions
make sure @ joomla 3.4.1 if not update
if @ 3.4.1 try downloading full joomla package , installing in extension manager.

hopefully doing backups.





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