Same situation!
After update WP to 4.9.6 version some images of the top menu disappeared, but another menu is OK. Theme by MhThemes.
Thread Starter
Daul
(@daul)
After bulk upgrading some plugins, the site was down yesterday. Only deleting that plugin via ftp did help.
Admin panel – Pie Register – Presentation Settings – Custom Login CSS
add
#login h1 a {background-size:100%;}
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