Smarty cache folder is now configurable via administration section. Default folder “cache” in the plugin’s home folder is not safe enough. Use path which is outside of your documents root or public_html.
This improvement will help with automatic plugin upgrades in the future. After folder is not in the plugins folder anymore there is no need to set write rights everytime plugin is upgraded.
It is also improving plugins security as some user were setting chmod 777 rights on this publically accessible folder, which is a serious security violation.