Hi guys,
Yahoo mail full version wont open with the Maxthon 5.1.0.1400 Beta version.Instead the classic version opens after asking to update browser warning.
I had the issue yesterday. The only thing I did that might have helped is to use the Calender button to open calender. It uses the new style. After that(maybe a reboot of M5) the new mail appeared. I don't think I changed UA, but that used to fix the problem too.