think this has been reported, I moved my cursor into the editor and everything disappeared, shut down and opened my last save was there.
also not an issue, the I open a new project, create a new custom html, then drop into the start well the page goes blank, may be intended, if so ignore, if I select top of screen html area appears, repeats every time,
Can you record the screen and share it in dropbox so we can see what’s going on?