先检查目录的写入权限问题，如果写入权限没问题就操作下面步骤
打开文件目录：/include/uploadsafe.inc.php
查找：（大致在45行）
$imtypes = array
(
"image/pjpeg", "image/jpeg", "image/gif", "image/png", 
"image/xpng", "image/wbmp", "image/bmp"，
改成：
$imgtypes = array
(
"image/pjpeg", "image/jpeg", "image/gif", "image/png", 
"image/xpng", "image/wbmp", "image/bmp"，
查找
$imtypes = array
(
"image/pjpeg", "image/jpeg", "image/gif", "image/png", 
"image/xpng", "image/wbmp", "image/bmp"，
改成
$imtypes = array
(
"image/pjpeg", "image/jpeg", "image/gif", "image/png", 
"image/xpng", "image/wbmp", "image/bmp"，“image/jpg”,
保存后更新缓存就可以解决问题。