Regen req'd so Profile shows pipe and surface at full length

[Chomlee]

Hi,
The problem is the profile's pipe and FS need to be "regen'd" each time they are viewed. Printing's regen does not fix this either and the print shows the pipe and surface not reaching the Chainage end of pipe. In MS there is no problem however in PS the problem occurs and the viewport needs to be toggled to MS and "regen'd" to show the full length.
B4regen.jpg shows that at chainage end CH 55.52 the FS and pipe do not reach the projected line from the bands. My next step was to go into MS throught the viewport and "regen" and the result was Postregen.jpg which is what I want to see.
I have not found a consitent reason why this occurs.

I hope this makes sense!