In the future — park your cursor on the timeline in Vegas where you want your image sequence to be imported. Now click the “open” folder, or choose “file/open” and navigate to your TGA sequence. Make your selection (first frame and range and choose “image sequence”) and then go ahead and click “open.” The Properties tab will automatically appear and you can select Pixel aspect and alpha.
To me this is easier in just one step instead of importing, then changing the properties.
You can also hit the “save” icon (the little disk symbo) next to the “stream” properties in the main Properites tab, once you have aspect and alpha defined. This will save that profile so that next time you import that file type and size, it will apply these settings as the default.
td