Issue with MS project 2007 - Lag time is messing with my task dates?

[Tirannie]

I'll try to explain this the best I can.

I have a number of tasks in a project plan I am working on that revolve around one date/task in the plan. I'm comfortable using predecessors and lag time to be able to set dates properly, but I am having an issue with this particular MPP and cannot figure out what it is.

In one section, I have linked a task to the one preceding it with a lag time of 4 months (ie: I need it to start 4 months after the preceding one finishes). No big deal. However, when I do this, it changes all of the dates in another section of the file that has no successors, predecessors or constraints associated with the original task or the one with the lag time predecessor. There is nothing that connects these two sections, except they happen to be in the same MPP file.

Has anyone had this issue, or know how to address it?

Sorry I can't attach a screen shot: proprietary information. If necessary, I can probably set one up with blurred out info if required.

 

[JulieInMaine]

Are the tasks As soon as possible or as late as possible? Do you have automatic leveling on?

Julie

 

[PDQBach]

Anonymize your display:

View > Gantt
Display the column UniqueID
Copy the contents from UniqueID and paste them over the task Name column.

View > Resource Sheet
Repeat the process and past the data over the resource Name column.

Now you can show us your problem.