[Can't Save Custom Tracks]

Thank you for the help! This project is awesome. Keep up the amazing work. 

[Can't Save Custom Tracks]

I am not sure if this has been posted about or not, but I can't save custom tracks. Each time I try to save one it shows the extension as .TD? and gives me an error. I tried manually changing it to TD6 like its suppose to be but that doesn't work. I also tried saving the design to my desktop but that doesn't work either. Any help is appreciated. Thanks!