I had to switch away from Firestorm briefly yesterday because I needed to upload images and take snapshots -- Firestorm crashes for me each time I do something, a possible conflict with my SkyDrive.
It's apparently a known issue with the viewer:
http://wiki.phoenixviewer.com/...
(And, in fact, other V3 viewers as well: https://jira.secondlife.com/br...
The solution seems to be editing registry keys, which I'm going to hold off on doing, hoping that the next update fixes this.