We can't figure this one out. The error occurs sometimes when a member attempts to upload an image. I just tested uploading images and could not trigger the error. Here's one example from the System Log 07/20/2023 01:37 PM upload_failure InvalidArgumentException (0) #0 /home3/ultravio/public_html/content/system/File/File.php(326): IPS\_Image::create('') #1 /home3/ultravio/public_html/content/system/File/File.php(436): IPS\_File::create('core_Attachment', '20190624_Rothen...', '', NULL, false, NULL, true) #2 /home3/ultravio/public_html/content/system/Helpers/Form/Upload.php(755): IPS\_File::createFromUploads('core_Attachment', NULL, NULL, NULL, NULL, 0, Object(Closure), NULL, true) #3 /home3/ultravio/public_html/content/system/Helpers/Form/Upload.php(309): IPS\Helpers\Form\_Upload->processUploads() #4 /home3/ultravio/public_html/content/system/Helpers/Form/Editor.php(766): IPS\Helpers\Form\_Upload->__construct('topic_comment_5...', Array, false, Array) #5 /home3/ultravio/public_html/content/system/Helpers/Form/Editor.php(185): IPS\Helpers\Form\_Editor->getUploader('topic_comment_5...') #6 /home3/ultravio/public_html/content/system/Content/Item.php(5072): IPS\Helpers\Form\_Editor->__construct('topic_comment_5...', NULL, true, Array, Object(Closure)) #7 /home3/ultravio/public_html/content/system/Content/Item.php(4749): IPS\Content\_Item->commentFormElements() #8 /home3/ultravio/public_html/content/system/Theme/Theme.php(885) : eval()'d code(5312): IPS\Content\_Item->commentForm() #9 /home3/ultravio/public_html/content/system/Theme/SandboxedTemplate.php(61): IPS\Theme\class_forums_front_topics->topic(Object(IPS\forums\Topic), Array, NULL, Array, true, NULL, Array) #10 /home3/ultravio/public_html/content/applications/forums/modules/front/forums/topic.php(611): IPS\Theme\_SandboxedTemplate->__call('topic', Array) #11 /home3/ultravio/public_html/content/system/Dispatcher/Controller.php(118): IPS\forums\modules\front\forums\_topic->manage() #12 /home3/ultravio/public_html/content/system/Content/Controller.php(50): IPS\Dispatcher\_Controller->execute() #13 /home3/ultravio/public_html/content/applications/forums/modules/front/forums/topic.php(39): IPS\Content\_Controller->execute() #14 /home3/ultravio/public_html/content/system/Dispatcher/Dispatcher.php(153): IPS\forums\modules\front\forums\_topic->execute() #15 /home3/ultravio/public_html/content/index.php(13): IPS\_Dispatcher->run() #16 {main}

OK, I think it has all come together now. I'll summarize so that a solution can be declared. My website began to have sporadic image JPG upload failures. I couldn't completely correlate upload failures with image dimensions or file size, although upload failure did affect mostly large dimension JPGs. We had no problem with PNG uploads of any size. We had been using ImageMagick all along. Lowering the ImageMagick quality setting did not fix the problem. Marc suggested switching to GD. That stopped the JPG upload failures. Thinking back, I realized that the upload failures began after the change to PHP 8.1.21. Randy suggested that the host might have missed setting some flag/option to ensure ImageMagick ran properly with PHP 8.1.21. So, as Marc suggested, I will ask my host to fix this PHP/ImageMagick incompatibility. Thanks to SeNior-, Randy, Jim M and Marc for their useful suggestions and help. 😃