whenever i shut down my computer and open it the next day cubik is gone and i have to reinstall it with the updater. is there any way to avoid this?

for me this is happening but its not just cubik. minersneedcoolshoes and novaskin don't recognize my skin either. in game with my friends they see my skin and i see my skin but in any program that searches for it online they revert to the default. i search my friends skins too and there is nothing ...