Hi folks. I have been having this issue where the LastPass extension in Safari did not have the "Copy Password" and other advanced options when looking at a site entry. Supposedly installing the binary version would provide these functions, but even then they did not show up. With some research I found that the LastPassHelper app provides these options, and since it was not starting properly with the system, they were not available. The workaround was to start the helper app manually before running Safari.
After doing some investigation I found that the binary installer includes a launch agent that should be starting the helper app. However, the plist file that defines the launch agent has an incorrect path. After changing the path from "REPLACE_HOME" to "/Users/<username>" the launch agent started working at boot again.
I took a few screenshots and put them in an imgur album here. I assume that the "REPLACE_HOME" bit of the string would be replaced by the installer, and it just needs to be fixed. http://imgur.com/gallery/40dv9