Are you all patched up? Does it crash with one of the sample projects?
Not sure whta you mean by patched up? It does fail on sample projects as well.
Have you run all the RH10 patches? – you should be on 10.0.1.292
As you also had this problem with Rh9, I am doubtful that it is a patch issue.
The sample projects contain some information about creating ePubs. See The Employee Care SSLs in the Employee Care project. Click Open on the RoboHelp Starter page and then click Samples in the ribbon on the left.
You have to keep the content very simple, virtually just text.
See www.grainge.org for RoboHelp and Authoring tips