@AndyB @Mike @Chris D I ran a google search and read this thread: https://xenforo.com/community/threads/invalid-image-type-while-rebuilding-attachments.70515 That thread is exactly what I am experiencing, except my issue has not been resolved. I ran this query first by Mike: Code: SELECT xf_attachment_data.*, xf_attachment.attachment_id, xf_attachment.* FROM xf_attachment_data INNER JOIN xf_attachment ON xf_attachment.data_id = xf_attachment_data.data_id WHERE filename LIKE '%.bmp' I went through and removed every BMP file (7) from the site and ran the query again. This is the result of the second running. MySQL returned an empty result set (i.e. zero rows). (Query took 0.0002 sec) The issue persisted when I attempted to rebuild the caches again so I ran this query by Andy: Code: SELECT xf_attachment_data.data_id, xf_attachment_data.filename, xf_attachment.attachment_id, xf_attachment.content_id FROM xf_attachment_data INNER JOIN xf_attachment ON xf_attachment.data_id = xf_attachment_data.data_id WHERE filename LIKE '%bmp%' This displayed an additional 12 images that had fullscreenshot3-BMP.jpg as the ending file. I went in and removed them all as well. I then ran the query again and got the same message. MySQL returned an empty result set (i.e. zero rows). (Query took 0.0001 sec) I still can't rebuild the caches. This displays every time I run it: Code: Server Error Invalid image type given. Expects IMAGETYPE_XXX constant. XenForo_Image_ImageMagick_Pecl::createFromFileDirect() call_user_func() in XenForo/Image/Abstract.php at line 254 XenForo_Image_Abstract::createFromFile() in XenForo/Deferred/AttachmentThumb.php at line 38 XenForo_Deferred_AttachmentThumb->execute() in XenForo/Model/Deferred.php at line 256 XenForo_Model_Deferred->runDeferred() in XenForo/Model/Deferred.php at line 390 XenForo_Model_Deferred->_runInternal() in XenForo/Model/Deferred.php at line 335 XenForo_Model_Deferred->run() in XenForo/ControllerAdmin/Tools.php at line 159 XenForo_ControllerAdmin_Tools->actionRunDeferred() in XenForo/FrontController.php at line 347 XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 134 XenForo_FrontController->run() in /home/iguana11/public_html/admin.php at line 13 I went in and emptied the TMP folder to make sure that wasn't causing the issue. It wasn't. The issue persists. This is my attachment stuff: file size: 4096 per message: 10 extensions: zip txt pdf png jpg jpeg jpe gif max size: 1600 x 1600 imagmagik flash uploader enabled Any ideas?