Bjarne,
I also just ran into this error. Here is what I did to fix it.
Make sure you are in edit mode:
Go to Admin->Languages ( yes you will get the error)
Under the error you should see a link for "Language Settings" go ahead and click this.
Check "Use Paging in Editor"
Set "Editor Page Size:" to 1000000 (or some other really large integer)
Click Update.
that should do it. If not you can edit the values directly in the database. (If you have access)
BACKUP YOUR DATABASE FIRST!!!!!!!!!!!
run these 2 scripts to check the language editors:
SELECT ModuleID, ModuleDefID, ModuleTitle, AllTabs, IsDeleted, InheritViewPermissions, Header, Footer, StartDate, EndDate, PortalID, CreatedByUserID,
CreatedOnDate, LastModifiedByUserID, LastModifiedOnDate
FROM dbo.Modules
WHERE (ModuleTitle = 'Language Editor')
SELECT ModuleID, SettingName, SettingValue, CreatedByUserID, CreatedOnDate, LastModifiedByUserID, LastModifiedOnDate
FROM dbo.ModuleSettings
WHERE (SettingName = 'PageSize') OR
(SettingName = 'UsePaging')
Make sure the moduleID's match. ( all the language editor modules might not be in the module settings table)
Run this script when you are confident. run these 2 scripts:
UPDATE dbo.ModuleSettings
SET SettingValue = '100000'
WHERE (ModuleID IN
(SELECT ModuleID
FROM dbo.Modules
WHERE (ModuleTitle = 'Language Editor'))) AND (SettingName = 'PageSize')
SELECT ModuleID, SettingName, SettingValue, CreatedByUserID, CreatedOnDate, LastModifiedByUserID, LastModifiedOnDate
FROM dbo.ModuleSettings
WHERE (SettingName = 'PageSize') OR
(SettingName = 'UsePaging')
Hope this helps.
Robert