Dear Marcin,
I am having exactly the same issue.
In the version 1.6.6.3 everything was working perfect, but stooped after 1.7.7 update.
I have added image row to the Fields Table, but when I am trying to add image(click-Select image) there just make it jump to the top of the page, and nothing else.
Could you please help to fix it.
Thank you,
Regards
Go??b