Up and down key doesn't work after hold the middle button of mouse

[ilcvm]

when I hold the middle button of mouse to roll up and down, the up and down key of the keyboard does't work. The function will back after re-open the pdf file.

[christina]

Sorry for this inconvenience.
This issue has been confirmed at this thread:
http://forums.foxitsoftware.com/showthread.php?t=12921&highlight=arrow+keys