I have also had issues using Release 5.1.3534.0411 with RREarth which were not limited to GE zooming in to a "singularity" and locking up all on it's own.
I am just getting started on a Google Support plug-in that among other things includes support for GE similar to but not the same as what Guino developed.
My target is the current release (5.1.3534.0411) but I am already having problems with the GE API in that some of the Tour methods don't work but fail with an error. I have notified Google of this problem but have heard nothing.
My intent is to use the GE APIs and minimize use of button pushes, mouse clinks, and other such "programmed operator" techniques (which generally are unwittingly designed to fail), thus the "...similar to but not the same..." remark.
I have been told that the GE 5.0... releases work with the current RREarth and are available form Google but I know not where.
Google claims the APIs will be backward compatible with future releases but we will see.
They seem to be emphasizing a plugin approach with browsers but I haven't even gone there.
I will publish what I have once I feel it is ready (or almost ready) "for prime time".