I find solution for this problem by myself.

Uninstall and then re-install the game, and delete all files in home directory (under my games folder) solves this problem.

<t> After I upgrade to 1.05, any kind of popup windows (Hex Details or Unit Stacking) does not appear after I hold my pointer on any hex for a long time. I have already tried the T and K hotkeys, they can change the popup setting (confirmed from display options window ) but the popup window still ...