1) if I paste "Personalization is not enabled and/or modifiable. The Enabled property must be set to true, and a registered personalization provider must be selected. The current user must be granted the right to modify personalization state." in this site's search box I get a browser error page saying "bad request" (HTTP error?). Is it some security feature of ASP.net that thinks this is too long input for the search box? If there's a limit why don't you add a maxlen there?

2) after upgrading older DB to use with newer MonoX I get:

Personalization is not enabled and/or modifiable. The Enabled property must be set to true, and a registered personalization provider must be selected. The current user must be granted the right to modify personalization state.

why?

also, during upgrade from 4.7.40.3540 (run scripts 3715 to 3842) I get error when running
01. Fix_Blog_Slug_IX.sql
The CREATE UNIQUE INDEX statement terminated because a duplicate key was found for the object name 'dbo.Blog' and the index name 'IX_Slug'. The duplicate key value is (Creating-ClipFlair-activities).
The statement has been terminated.
and had to ignore that upgrade script - however I don't think this is causing the issue, I think I've seen something about personalization here before, but can't spot it at the moment with the search