I am having the same problem. I have the extension checked off in both ArcCatalog and ArcMap, I have assigned the spatial reference system, and geo-enabled the personal database. The Get Data For ArcPad buttom is highlighted, but doesn't present scroll over text or initiate any action (the visual effect of depressing the button does not happen either). The Check In ArcPad Data and GPScorrect SSF buttom is not highlighted even when I have started an editing session in the Trimble GPS Analyst toobar.