there are a few issues I see:
1) Validation Toolkit, HTML Editor, Digital File Pro and Universal Email should be uninstalled completely, not just disabled in the extension manager.
2) The Dreamweaver 8 recipes extension is not compatible with DWCS5, neither is the eCommerce recipes extension.
3) Site Assist 3 is not compatible with DWCS5, Neither is Site Assist Pro 1 or the Constant contact join My Mailing list extension.