This issue does not affect playback of 24 bit audio through DAW software. TASCAM is preparing a new Windows driver to resolve this issue and will publish it on the TASCAM website when it is ready. This may cause a STOP Error (Blue screen) when a system audio event is played back.
A problem may occur after installing Windows 8.1 Update 1 (KB2919335), and connecting a TASCAM USB Audio Interface and setting the Windows Sound settings for the Default audio Format for shared mode to 24 bit.