Shoutbox

You have to do the next:

Plus!>>Preferences>>Save/Load>>Export my preferences

This will made a .ppl file

After reinstalling Msg Plus!...

Plus!>>Preferences>>Save/Load>>Import my preferences and select the .ppl file

If you did this, when you restore your backup, you have to choose the .ppl file, if Plus! doesn´t detect the .ppl file, it won't restore the backup