Language error in Advanced poll 2.0

Okay, first of all, great script! Next, I am having a problem. I installed it and it was working GREAT for a week, then all of the sudden my admin area only displays an "S" wherever a word should be. If I go into the prefs panel and reselect language as "english.php" from the popup menu, it works fine until I change pages. I do save my changes of course, yet it is not working properly. Acts as if it has lost touch with the language file. I really love the script and would appreciate some assistance with this error. Thanks in advance for all who assist me with this!