I just stumbled upon something which may cause confusion when using FindImagePos or WaitScreenImage.
If you use the image recognition wizard to capture an image, it places the bmp files in %bmp_dir%. This is a subfolder of your script folder, and will have the same name as your script. For example my documents/macro scheduler 14/oldscriptname/image_1.bmp
Renaming your script will cause it to look for those images in a different folder, which doesn't actually exist. For example my documents/macro scheduler 14/newscriptname/image_1.bmp
This will result in a "cannot find image" error.
The simple solution is to rename the folder from oldscriptname to newscriptname.
I hope this helps someone.
