I encountered apparently the same problem. I first saved a reference with my bookmarked « save to zotero » URL. Worked well. The second time, I had to log on the pop-up window but can not interact with it. I am able to fulfill the blanks, but not to validate.
That's not the same issue — it's a problem that can occur when using the boomarklet in Safari due to Apple's Intelligent Tracking Protection. See my explanation here:
Upgrade Storage
I first saved a reference with my bookmarked « save to zotero » URL.
Worked well.
The second time, I had to log on the pop-up window but can not interact with it.
I am able to fulfill the blanks, but not to validate.
I work on iOS.
Kindly,
Simon.
Best,
Simon.
https://forums.zotero.org/discussion/comment/332216#Comment_332216