It behaves like this (goes blank in saving)
1. if u have comment in HTML
2. if u have written any browerse based checkes in CSS/HTML
3. HTML is not properly formated.
Kindly do check your HTML Template for above mentioned things..
@the4gamblers / @pradeep sharma - Latest version should be able to ingest more html errors than the previous, so chances are that also badly formatted templates to work.