I can't post photos anymore, advice please

[McCreed]

The past 2 days I've tried posting photos and when I click "Upload File/s" the dialog box closes and there's no photo in my post.

I've tried clearing the cache, log out/log in. Photos have all been sized appropriately and jpeg format.
I use Chrome and it self-updated so I don't know if there's a connection there

Any help appreciated.

Cheers,
Mick

EDIT: I'm using the "Insert Image" button on the control panel.

EDIT: It appears I can add them as Attachments, but not embed them from Insert Image (????)