Hello,
Strange problem. I checked my system. I am using LV 7.1, IMAQ VIsion 7.1 for LV and NI-IMAQ 3.0. I uninstalled IMAQ Vision and NI-IMAQ. After that installed Imaq Vision 7.0 which automaticaly installed version 2.6 of the NI-IMAQ driver. With this setup I still have the property Image Area Size (take a look at the attached picture). The VI still works as expacted. Could you try to upgrade the NI-IMAQ driver to the latest version. You can do that at the following link:
Update DriverDownload version 3.0.1 under header Driver and install this one.
Hope this helps.
Best Regards,
RikP
Application Engineering
National Instruments
Rik Prins, CLA, CLED
Software Development Engineer