Basically, if I add a comp to the render queue and then click on the export location, nothing happens. This is the same no matter which project I try, and I have already restarted AE and rebooted the two computers that show this behaviour. The same projects work just fine on a third machine. Any help would be greatly appreciated.
Nobody can tell you anything without proper system info or other technical details like version of AE, storage configuration and so on.
Right, sorry. Both machines are running the current version of AE CC, and run on Windows 8, both are connected to the same RAID system, but other than that they are two completely different machines. The third machine also has the same AE version, also runs on Win 8, and is also connected to the same RAID, but doesnt have this problem.