@johbri Dear, I am sorry to hear about this problem that you're encountering. It can happen due to slow Internet connection, inadequate format of items, overall large set size (in MB)... Administrators have applied a fix on AUG 28, 2018 for item uploads so that they take up less space on the site, resulting in overall smaller set size and, consequently, less errors on publishing. (When I say set size, I do not mean smaller dimensions of the published set, but a "less heavy" set, measured in megabytes).
Have you been using older items in your sets (uploaded before AUG 28 fix)?
Which browser are you using? Please make sure to include browser version too.
Which operating system do you have?
What is your Internet speed?
This information will help the administrators discover and solve the problem.
Thank you for your time.
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