I am having trouble with using the program. I can use the subtract feature for a decent amount of time but after so many uses the part I am working on just disappears completely. The part I am designing isn't even that complicated so I wouldn't be expecting this to happen. I have tried uploading the .mcx and .stl file but I am not allowed to but I have attached some images to show you what is happening. Is this just a limitation of the software or is it a mistake on my part?
Image 1: The part is ready to be subtracted with a chamfer tool I have made.
Image 2: The subtraction has taken place.
Image 3: The part has disappeared when I have started to perform another task.