it's just not the right size
this is completely incorrect
the MAXIMUM size is 75x75 for an avatar, and even if you upload a large picture it will scale it down to 75x75 (although it wont look good)
the real issue is that the version of smf blockland forum runs on has a stuffty false positive threat detection system, and it will think that certain data in images are actually malicious exploits trying to attack the forum
your easiest option is to just change small aspects of the image like cut off a row or column of pixels or add a row or column of pixels to shift some data around in the image, shift the colors slightly, these arent exact sciences but it can result in your image being accepted
the more reliable method is to get some sort of image editor that doesnt or has the option not to save meta data in the image
sometimes its not always an issue of the meta data and this stupid forum stuff is actually just forgeted
