Hi there, this issue has been fixed in the previous Alpha version.?
You can try to open the browser menu (Alt+F) > Settings > General > Import local data and HTML > Maxthon 5 (Guest).
Currently, it only can import the history data from the Guest account. If you'd like to import the history from the registered account, you can press the keyboard "Win+R," run "%appdata%," find the folder "Maxthon5," then find the folder "History," use the file History.dat of the registered account to replace the history file under Guest account. Then you can import the history data by importing the data from Maxthon 5 Guest account.