Describe your operating environment, otherwise we can't discern probable causes given the symptoms.
Are you running any scripts? Does this happen outside of Tribes? If you go to the server list and call up the info box for a server, can you drag that box around?
I don't think it'll have to do with the auto-repair script in PJ's pack; only bug that causes for me is the weapon it switches to after repairing occasionally fires on its own. Can't think of any of the other scripts in the all-in-one pack that would cause hold-weapons to fail.
Comments
Are you running any scripts? Does this happen outside of Tribes? If you go to the server list and call up the info box for a server, can you drag that box around?
I can drag around a window, its really weird, if I click real fast I can get the CG to start to move, but not enough to shoot.
Are you running scripts other than PJ's pack?