As of the 1.4. beta versions, StarTools stores the masks you used in the StarTools.log file.
This StarTools.log file is located in the same folder as the executables. The masks are encoded as BASE64 PNG images. To convert the BASE64 text into loadable PNG images, you can use any online (or offline) BASE64 converter tool.
One online tool for BASE64 is Motobit Software's BASE64 encoder/decoder.
Simply paste the BASE64 code into the text box, select the decode the data from a Base64 string (base64 decoding) radio button, as well as the export to a binary file, filename: radio button. Name the file for example "mask.png" and click the convert the source data button.
This should result in a download of the mask as a PNG file.
Bin the image up until each pixel describes one unit of real detail.
Chances are that the image looks terrible, which is - believe it or not - the point.
Once all issues are fixed, launch AutoDev again and tell it to 'redo' the stretch.
You can convert everything you see to a format you find convenient. Give it a try!