Why I cannot copy the data from Mathcad and paste it in EXCEL

I used to use full version MATHCAD. By using "Select All" and "Copy Selection", I can copy the data from my mathcad worksheet, and paste it to Excel directly. Recently I am using a trail version in a Windows 8 system. When I tried to do the same thing, by selecting some data and click "Copy selection", it shows a bitmap or some other kind of figure will be pasted to the excel, instead of the data itself. I do not know what happened, and just want to copy the vectors of data. Would anybody know how can I solve this problem? Or is it a restriction of trial version? Thank you!