This is a very stange problem.
It started a few days ago, without any particuliar reason. When I type it in the Finder (no such problem when using other applications), the : key no longer writes the : ponctuation sign but it produces the minus sign (-) instead.
The day before, it was the @ key that dispalyed the < symbol, but this time rebooting took care of the problem.
Does anyone know how I could fix this ? (Again, this problem occurs only in the Finder )