Stability issues have been reported, often during the upload of ROIs to an iPACS server, that are caused by VQ having more file descriptors open than the limit allowed by the operating system. On Mac OS X, this default limit tends to be lower than an other systems. We apologize for the inconvenience, but the best solution to this at the time is to increase the limit for your computer.
The file descriptor limit can be increased using the following command
$ sudo sysctl -w kern.maxfilesperproc=512