the msg_flags plugin, does not work anymore since I updated squirrel from 1.4.20 to 1.4.22. The button to flag messages is gone and the nice pictures of mail envelops are gone. There was no error message during the installation regarding this plugin.
This tracker is to report bugs for the core SquirrelMail product. Your report is not against SquirrelMail core, NOR is it a bug report.
You are having problems installing the plugin and should ask for help on the squirrelmail-plugins mailing list.
Hint: when you install the plugin, make sure to read the documentation and follow all instructions.