I've seen on a few occasions that bogging down the LabVIEW IDE with a process (loading a large project will do the trick) and then trying to launch a VI from explorer (or from an internet browser which just downloaded a file) can cause a second instance of LabVIEW to start up (the same version as currently running).
Are there any dangers to this or should they coexist peacefully or is this (as I think) a perfect recipe for disaster?