Reporting this bug, which is apparently still present.
Other users are facing that issue: http://blog.gmane.org/gmane.comp.cms.tiki.user
When uploading a bundle of images contained in a zip file, and selecting the option "Unzip zip files", all the images are well extracted and added to the gallery. However, the file type (in my case png, but I guess this is the case for all file types) is not reconize and the files have the type "application/octet-stream". Consequently, inserting the image in a wiki document for exemple, and changing its size, will produce the message "File is not an image"
I was able to reproduce it on tiki 7.2. Attached some screenshots of the problem.
r40079 introduces a new feature for file_gallery to modify the mime type of images (and pdf) based on file extensions. There is a preference on the file gallery admin page to activate this function. It will replace application/octet-stream with
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