I've recently found this kind of problem using the timetable editor.
After input some line inside the timetable, I tested it without no problems, I saved it and go out.
If I re-open the timetable I find, in the Loco column, in the lines were in did not input operation ( i.e. if I input only one line, it is repeated for 299 lines!), the script "@00", this is enought to let the Timetable operation to go in Buffer Full.
The strange fact is that the timetable inputed some moths ago do not present this problem.
Did you hear something similar? I've already re-installed the program (WD 8.1.4 ENG)
Thank you in advance for your help.