I had this issue a while back, this should fix it for you. Hope it helps!
• Shutdown Wizard101 • Click on the Finder icon • From the “Go” menu navigate down to “Go to Folder” • In the field that opens, type: ~/Library • Click “Go” • Inside the Library, navigate to: Application Support/Wizard101/Bottles/wizard101/drive_c/users/crossover/Local Settings/Temporary Internet Files/Content.IE5/ • Delete everything you find inside the "Content.IE5" folder • Launch Wizard101 and log in to play
If you continue to experience difficulty, please feel contact Codeweavers for advanced technical support. You can reach them at http://www.codeweavers.com/support/ Please note that Codeweavers technical support is FREE for Wizard101 and you do NOT have to purchase any additional software.