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Source evidence

Fullscreen → Security Check Failed

PDF.js Viewer · support · 2026-04-16T18:58:00+00:00

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flips01 resolved
A customer of mine is using pdf.js (3.1.0 on multisite WP 6.9.4), and the plugin seems to still work fine, except when I click the fullscreen link. Then we get a wordpress error screen: Security Check Failed I’m not sure if this is the same as what’s mentioned in the sticky post here. I tried clearing browser cache etc. But the error looks like wordpress’ own. (I can clone the site to a lab and turn on debug mode if more is needed.) Well you found a bug and I apologize for not finding it sooner. I’ll get out a fix, but if you need something now, and you’re a developer, you can: Go to the settings page for this plugin. Right click on “Page Mode (aka Sidebar)” and inspect. In the inspector, find the next TR, which should be set to display none. Make it visible and then uncheck that option, and save. Seems to be fixed, thanks! 😀

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Thomas McMahon 2026-04-17T01:38:00+00:00

Well you found a bug and I apologize for not finding it sooner. I’ll get out a fix, but if you need something now, and you’re a developer, you can: Go to the settings page for this plugin. Right click on “Page Mode (aka Sidebar)” and inspect. In the inspector, find the next TR, which should be set to display none. Make it visible and then uncheck that option, and save.

flips01 2026-04-21T11:39:00+00:00

Seems to be fixed, thanks! 😀