Hi, gazumped. Thanks for the reply. I did wonder about the wisdom of sharing logs on this forum, so thanks for that advice.
Windows version is windows 10, version 1709, OS build 16299.371, (a 32 bit version)
Android version is 4.2.2. running on a Fairphone FP1-U (which comes rooted)
I've checked the user details and they are the same
At least one of the notes that I couldn't open (on Android) said it was 'shared' which made a little sense of the dialog that appeared when I tapped the padlock (as above). Trouble is, when I checked on windows, I hadn't shared it, and the settings were purely user-only.
When I did not get a reply to my post (until yours), I continued experimenting, including, as you suggest, copying the content of the note into a new body which worked for the note I copied but not of course the others that wouldn't load. (I did not systematically go through counting the number of notes that wouldn't load but there were several). Also I eventually 'revoked' both devices, uninstalled evernote on both devices and (after cleaning and rebooting etc) reinstalled evernote on the phone and then logged back in, which seemed to resolve the problem for the rest of them. I did firstly get a sense that it may have something to do with the download speed, as you also suggest, because the note I copied into a new body had a lot of hidden formatting, which I removed by copying the text into notepad and then recopying this back into evernote. But I also wondered whether (in the basic version?) evernote sometimes loses track in some way of how many devices you have/whether notes are shared, and needs 'resetting' as I have done with revoking/uninstalling/reinstalling and logging back in.
Thanks for your help on this anyway. I am close to subscribing as I do find Evernote good in other respects, and I wonder whether this would clarify issues such as these (and being able to download to the phone would be useful). If you have any comment on this I would be interested, don't worry if not. Thanks