A strange useless button causes bug

Today I found a strange useless button on the top of page, as the picture shows.

https://s3.amazonaws.com/zotero.org/images/forums/u13832654/3fchlwmir48v5af7c1t5.png

I can't click the button and I suspect that "Ethereal Style for Zotero" caused this problem. When I disable all the plugins, the button is still there. And if I use "Ethereal Style for Zotero", the background color of the first paper can't be changed unless I close the page and reopen it.

Before the bug appears, I run command "zotero -p" and create a new profile named "develop" in the dialog window. And that time the bug appeaearred. But later I deleted the profile and its files in C:\Users\13015\AppData\Roaming\Zotero\Zotero\Profiles, nothing went better.

My error report number is 2040584174,pls help me.
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