Guys - Scratch the last post
Just on a hunch decided to do a clean install
Exported bookmarks first to a html file
Completely un-install previous version, crap cleaner to route out any remaining registry fluff (there were a few)
Checked hidden folders (appdata etc) for any leftovers - Actually your un-installer in windows Start menu is pretty efficient in this regard ...
Re-install and setup 18.104.22.168 as usual with the downloadable installer
Got comfortable again with all usual settings, un-installed that share extension, disabled Remoting viewer etc ..
Result = No more problems with the home page. I believe it was probably something left behind at each install overwrite which created my problem.
Edit: Updated my bug report
- [at] Moderators, that can be closed