New Version Breaks Woocommerce and The Events Calendar

When I upgraded all my sites to 3.6.5, it breaks the checkout function in woocommerce and it freezes. I also am seeing similar behavior in the events calendar, which just freezes when switching views. I went back a version to 3.6.4 and all is normal again. Please let me know when there will be a fix and it is safe to upgrade once again.