I used KSPTOT with KSP 1.1 with no troubles. With the latest version 1.5.6 and KSP 1.2.1, KSPTOT will get orbit info, but will not read maneuver nodes. It just goes "ding", no error message. Maneuver nodes created in TOT will correctly upload.
Here's the relevant (?) error from the log:
Any ideas?