Sounds like the speckz.org hosting services do not have a working GD or ImageMagick
you can that by going to Admin menu clicking the [+] or :: and clicking phpinfo, look for a GD or ImageMagick info box somewhere halfwayish on that page.
If neither is listed then you need to speak to the host and get them to add one. Also check the PHP memory_limit, for working with Images you need it set to at least 16Mb or ideally 32Mb, against ask the host.
Alternatively try a TikiFriendlyHosts