Hi Smallbiz,
Lightroom opens the import dialog box when a memory card is detected.
You can disable Lightroom to do so.
Please follow the below steps.
> Open Lightroom
> Click on Lightroom > Preferences
> Go to General Tab
> Disable the option "Show import dialog when a memory card is detected
> Restart Lightroom and check.
Now Lightroom will not open the import dialog box after connecting a memory card.
Please let us know if this helps.
~Mrinmay