RE: Importing custom reports into GP
It sounds like one of two things.
1) You have not given rights to the other users for this report.
2) You have not published this report to the shared reports dictionary.
So the potential solutions are:
1) Tools->Setup->System->Alternate Forms and Reports. Enter the ID and make sure that your users and yourself share this same ID. Then give rights to use this modified version of the report.
2) Tools->Setup->System->Edit Launch File and highlight MS Dynamics GP. Make sure you are pointing to the shared reports dictionary and not your local copy. If a change is needed, make sure you exit GP and re-launch. Having done this, them import the package. This will import the report into the shared REPORTS.DIC
Please let me know if this resolves the issue.