There is a limit to how many poles can be joined together in one strain section (segment) in the version 6 profiler. If you have too many poles in one section they are not stored correctly resulting in subsequent errors. The errors may only be seen when you save and then reopen the profile.
To determine the approximate maximum numbers of poles in a segment take the average length of pole IDs, add one then divide 254 by that number.
Break long strain sections into more than one segment in the profile. You may need to manually calculate and enter the MES of the strain section.
This limit does not apply to version 7. However you may get an error when opening a version 6 profile file in version 7 if there are too many poles in a strain section.