Core

TYPO3 6.2 offers Configuration Presets section in Install Tool. There seems to be some problem with saving for example settings from 'Extbase object cache' section. First it does not have default value checked - both APC cache backend and Database cache backend are empty. If i select 'Database cache backend' as active and save configuration than conformation messages shows it as:

'SYS/caching/cacheConfigurations/extbase_object' => 'Array'

If we now take a look at LocalConfiguration.php than we see:

'caching' => array(
'cacheConfigurations' => array(
'extbase_object' => array(),
),
),

so the selected value is not saved.

Now probably because of this if we check Database Analyzer in Install Tool we will see this 2:

ALTER TABLE cf_extbase_datamapfactory_datamap RENAME zzz_deleted_cf_extbase_datamapfactory_datamap;
ALTER TABLE cf_extbase_datamapfactory_datamap_tags RENAME zzz_deleted_cf_extbase_datamapfactory_datamap_tags;

Now if some user remove this tables it will break his frontend and results with a lot of DB errors in Backend because various queries to DB fail.