by AverageJoe » Tue Jun 02, 2015 5:23 pm
Open the World of Warcraft Classic folder on your computer and locate the "WTF" folder. Inside the WTF folder, see if a file labeled "config.wtf" exists. If it does, double-click it and open it with Notepad. Search for the word "resolution" (I think it may be part of the setting "gxresolution" but I'm not 100% sure).
It should say something like "set gxresolution "XXXXxYYY" where X and Y is your monitor's resolution. What value does it specify for the X and Y? If it's something weird like "1366x768," try changing it to the resolution your monitor is presently configured for (Like 1920x1080 for example) and click "File" > "Save" then close the config.wtf file and try opening WoW again; see if anything different happens.