There is no need to uninstall. Just install again. If you uninstall you will lose all your data. But the point here was to try a different server, not a new installation. In any case remember to backup your site first.

Here's what I have done.

Turned on max debugging
Backed up the site, then disabled all of the most recent extensions one at a time, nothing changed.
Installed K2 again over itself, nothing changed
Used Akeeba backup and installed the full website in another folder, still the same result.

Would you like to login to the test site and see for yourself? I don't know what else to check?

I have further discovered that this issue has something to do with the data in the database. Using my providers phpMyAdmin console, I exported all of the K2 tables. Then completely uninstalled K2. After reinstalling K2, I was able to create a K2 item and save it. The "Save" button and "Save & Close" buttons both worked normally. Then I imported all of the original K2 data back into the database truncating the existing data. After doing this, I had all of my original K2 data back. However, now any time I click on the "Save" or "Save & Close" buttons, I get the blank white screen.

I am pretty sure this is a server issue. Are you under Apache? Have you any custom .htaccess rules ? As i told you, i would try to install the site on a local development environment.

I found the problem in the language file 'en-GB.com_k2.ini' (/html/mysite/language/en-GB/en-GB.com_k2.ini) here 'K2_YOU_ARE_ALLOWED_TO' is completly missing!

As to my German language file, ( de-DE.com_k2.ini ) here I found this entry:

; K2_YOU_ARE_ALLOWED_TO="You are allowed to:"

so I removed the ';' changed the text inside the " " and all worked well.

Ofcourse I also added ; K2_YOU_ARE_ALLOWED_TO="You are allowed to:" to the English file
(without the ' ; ' at the beginning!

Hope it helps!

Stefan Chaproniere wrote: I found the problem in the language file 'en-GB.com_k2.ini' (/html/mysite/language/en-GB/en-GB.com_k2.ini) here 'K2_YOU_ARE_ALLOWED_TO' is completly missing!

As to my German language file, ( de-DE.com_k2.ini ) here I found this entry:

; K2_YOU_ARE_ALLOWED_TO="You are allowed to:"

so I removed the ';' changed the text inside the " " and all worked well.

Ofcourse I also added ; K2_YOU_ARE_ALLOWED_TO="You are allowed to:" to the English file
(without the ' ; ' at the beginning!

Hope it helps!

I have registered on this site just be able to write to you Stefan and say thank you, this one helped me. Thanks