Each software has some limitations and need to be improved with time,similar is the case with Drupal. Now we have Drupal's latest versions in our hand i.e Drupal 6.8 and 5.14.These updates have been made in the previous versions which were being used Drupal 6.7 and 5.14. As the previous versions were not suitable for use in combination with versions of PHP before 5.2 released. No doubt 6.7 and 5.13 releases were able to remove the flaws by reportage via bug tracking system and critical security weakness.
Drupal 6.8 has eight major maintenance releases from the previous version and are generally called as the eight maintenance release of the Drupal 6 series. Only fixes for bugs have been promised in it. New features are only being added to the forthcoming Drupal 7.0 release. The bug reported in 6.7 release is: Rolling back PHP 4 incompatibility.
Similar to 6.8 release here in 5.14 release there are fourteenth maintenance release of the Drupal 5 series. The bug reported in the 5.13 release is : Rolling back PHP 4 incompatibility.
Even after the up gradation of Drupal 5.12 to Drupal 5.14 it is suspected that under certain conditions HTTP_HOST is not defined or sent to the Drupal website. This in turn affects Drupal 6.8 also.
Both Drupal 5.x and 6.x branches are under maintenance,so there is requirement to give bug fixes (not merely bug reports) more maintenance releases regularly. Also there is need of running update.php to refresh the menu cache and other caches on the website.
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