I loaded 0.6.2 on the 64 bit machine this morning but it did not overwrite the (much) earlier version already there. There were no preferences in that version.
It seems that there is no difference between the 32 and 64 bit versions.
@meme is right about the missing DOCTYPE
It looks as if calibre is removing it.
If I enable Pretty Print and tick 'Automatically clean and format HTML Source code' on 'Open' everything works as expected. No errors and lots of nbsp's
My problem seems to be sorted.
Thank you everyone who got involved.
Last edited by boatat72; 12-15-2012 at 07:52 AM.
Reason: re-testing with 0.6.2