If you meet the problem with using one of the PC software Timecontrol or LEDcontrol (including V2 and V2.1) to program the TC421 time sheet,

like: the save & cancel button disappear when you add a new mode, or wrong text display,this is often caused by incompatible Windows system languages,

at this time,please do as follow:

After clicking the "+" button, please enter your mode name,

then press the "Tab" key,

and then press "enter" key to instead of click the "ok" button.

Demo:https://youtu.be/dYEBL8G1W2Q

Or please try another control soft vision, thanks.

《Timecontrol》（the lastest vision):

http://www.worlduniqueen.com/support_list.aspx?id=192&type=1&typeid=15

《LEDcontrol V2/V2.1》:

http://www.worlduniqueen.com/support_list.aspx?id=188&type=1&typeid=15

there is also other help doc on our website, please view the SUPPORT-Technical Services to find more,and if you find any other problem in using TC420 and TC421, please contact us, thanks.