Hello,
my Clarity version is R12 SP with Prince2 and PMO accelerators. The setting is that PM is automatically added to project team. That is not the problem. Collaboration tab is displaying correctly. If logged user is not member of team, tab is not displayed, if it is, tab is displayed. That is OK. But the problem comes when user click the tab. Collaboration tab is displayed, but with no content. I think that this could be some kind of defect, that is caused by incorectly XOGed objects, but there were no errors when exporting or importing xog xml files. I was transfering modified Project and Task objects, one new Process, two portlets, one page, OBS etc. from test environment to new production environment. None of transfered informations seem to be related to Collaboration...
Currently I am trying to reinstall DB, accelerators and to XOG information in parts, to see when and if the problem will raise again.