[Wild.Bill.Kelso]

There is a checkbox on that Import Buttons window (Build Buttons tab) that says to look in the image's filename for a delimiter '_'. If you have that checked, then uncheck it and try it again.

Yes, the drag and drop is the best way to go most of the time. Usually your adding a few images at a time and that works well. The Import Buttons window is more for Importing lot's of buttons quickly. If you use a tool to create your images that lets you export and automatically name them, then it can be quite handy to prefix a bunch of buttons with Game_XXXX.gif for the game tab; and Sys_XXXX.gif for the Systems tab, etc... Then this delimiter can be quite handy. You can quickly import 100 buttons and have them automatically put on a Game and Sys tab by having the Import process look at the image's filename.

Check it the Help file, under Toolkit Interface/Import Buttons...