When trying to upload a picture I get the error "Suspicious image upload refused". I tried it with protector disabled but I still get the same error. What could be the problem? Uploading pictures used to work before!

Xoops version is 2.5.4, Extgallery version 1.1

Did your host maybe upgrade your PHP and mess up your php.ini file?

Sounds like they did something if you didn't.

These are the server stats (shared hosting...).

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what is your image?
It seems Xoops uploader block it.
it seems it is because of old IE browser?

see in class/uploader.php around line 366:

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Don't insult a proud Mac user by suggesting he works with old IE I did some further testing and found the extension .jpeg is the problem, when renaming to .jpg the upload runs fine. I tried uploading .jpeg with chrome and firefox, so the problem seems to be browser independent.

maybe the picture was originally a jpg not a jpeg.
Xoops will recognize such a file as a malicious attack.
Also as you may know it easily be possible to embed a malicious file inside a nice picture. these files all will be blocked by xoops uploader.

Also you can check your include/mimetypes.inc.php to find if the following mime is exist or not:
'jpeg' => 'image/jpeg' ,

Honestly the above file is really outdated these days.
we need to have an advance mimetype manager in xoops 2.6 that could accept adding mime in the database and have permissions for groups like webmasters and registered users.

currently many modules like extgallery have their own mimetype tables in database which is really in conflict with the core.
Core 2.6 should end these mess and unit all of that.
I sent a feature request to the tracker and i hope core team include it in the next release.