[wp-trac] [WordPress Trac] #48853: Error generating thumbnails of PDF files

[WordPress Trac]

#48853: Error generating thumbnails of PDF files
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 Reporter:  joseaneto                            |       Owner:  (none)
     Type:  defect (bug)                         |      Status:  new
 Priority:  normal                               |   Milestone:  5.5
Component:  Media                                |     Version:  5.3
 Severity:  normal                               |  Resolution:
 Keywords:  reporter-feedback 2nd-opinion        |     Focuses:
  needs-testing                                  |
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Comment (by skylabb):

 I have the same issue with uploading PDF with exact error message. Some
 more details per my observation:

 I don't think the problem is caused by any plugin conflict. I deactivated
 all plugins for the site and the problem persisted. Of this same site
 running the past couple years using the same server and WP theme, I never
 had this issue until recent along with a bunch of other users after recent
 WP upgrades.

 The issue is that after I hit the upload button, a new square box in the
 media lib view pan indicates the upload process RED bar. Then the error
 message comes up. And if I refresh my screen, the uploaded file shows up
 in libary list. It seems auto server response process is not working
 properly in the uploading process requiring a screen refresh.

 Also interestingly, I have a different WP stall in latest version on a
 different server and using different theme, the second site doesn't have
 the upload issue. The square box in library pan shows a BLUE upload
 progress bar, then the screen refreshes itself to show success upload
 updates.

 From my observation above, I'd say the latest versions of WP are having
 some glitch or conflict issue with certain server environments or design
 themes. But, you can't blame the server or theme because these used to be
 working just fine. It is WP that introduces somethking new that comes into
 conflict with existing setups. And this seems to be affecting quite a few
 sites, not just a couple isolated cases. In other words, WP is the
 problem.

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Ticket URL: <https://core.trac.wordpress.org/ticket/48853#comment:27>
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