My web site is installed on Ubuntu 15.04 and using Apache 2. Had some issues getting the sendmail installed and working. During the process of getting the sendmail to work, I deleted files and things to make it work that were suggested by others with similar issues. Sendmail is now working properly but now I can no longer log into my admin CP. The admin login page comes up and when I enter my login info the little animated icon in the upper right scrolls like it is logging in, then just stops and sits there with the blue screen and the word Xenforo in the middle of the screen. The rest of the website works just fine. I am not sure if perhaps I deleted a cache directory or what. I have tried to retrace my steps, but am at a loss. I don't want to re-install 1.5.0 over the current setup and risk wrecking anything I have already set up. Any idea where to look or a direction to go in tracking down what I did wrong?