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WordPress 3.6 is compatible with ClassiPress 3.3 and with the ClassiPress Development build.

Cheers

You can find information regarding the Version 3.6 at:

Release notes
http://codex.wordpress.org/Version_3.6

Release post
http://wordpress.org/news/2013/08/oscar/

To migrate hierarchical taxonomies you can use:

- (export) BulkPress Export plugin: http://wordpress.org/extend/plugins/bulkpress-export/

- (import) BulkPress plugin:...