Imported From: http://groups.google.com/group/in-portal-dev/browse_thread/thread/950109cb7006179e#
In one project recently revealed the problem - the administrator has entered
into CMS-block too long HTML. As a result, HTML was cut up to ~65000
characters, cutted up incorrectly, with a broken tag. Because of this the
next time admin try to to open a CMS-block for editing - occurred js-error
and the admin could not fix anything.
I propose either
1) change the field type, which stores the text of CMS-block in the
database, so there may be placed a longer text (mediumtext or longtext)
or
2) make validation for add/edit CMS-block form, so that in case of field
overflow, the validation error prevents incorrect data saving.