The Power Tweaker was designed for NL v1.26. I have plans to update the tool, but haven't had the time yet. The problem is that with v1.3 new data structures were added to the track file format. These new sections of the file are not readable by the power tweaker. Odds are, if you are attempting to use the power tweaker on a normal steel coaster that does not contain anything that was new in v1.3 (such as wooden coaster types, wooden support beams, catwalks, or prefered environment) the power tweaker might be able to correctly load up a file. If any of the new stuff is in the track file, the power tweaker will not load the track correctly.
- Tia