Be aware that MRI images tend to require lots of memory to display. And in order to optimize performance, every FIV display window that you open contains a full-size copy of both the structural and functional images.
In order to keep users from hogging resources, we’ve capped each running copy of FIV to use a maximum of 512 MB of memory. That’s plenty of memory to open more than a dozen windows in 222 space, so most users will seldom hit this cap. However, users who wish to view images in 111 space may need to be more judicious with the number of windows they have open at any given time.