Thanks, Tom
I just had a friend help me out to solve my problem. I use Canon. Within the Canon software under preferences, there is a tab called Linked Software. In the drop down window I had choosen Lightroom. It turns out this should be None. With Lightroom choosen the Canon software is telling Lightroom to open and causes the Import dialog window to open.
Hope this is your problem also.
Tom
(Except people calling me Josh. ;) )