This is a really rare bug and sorry to hear it effected you. Solution is simple though:
1) Navigate to the following folder: C:\Users\your windows username\AppData\Local\dof\
Keep in mind you might have to set "Show Hidden Files" On in the Tools - Folder Options (it`s at the top bar on any window explorer window)
2) Inside that \dof\ folder you`ll find a file called local_saved_data, delete that file, and problem will be fixed.