1.a picture didn't show up
and it put 2x submit post to successfully post
2.
3.and why all is go to //dot_post ,etc
4.[Showcase forum]
and why the preview didn't show up
I'm having difficulty understanding what you're saying most of the time.
But from what I can get:
1. get the URL of the image that doesn't show up (right-click -> copy image location, or use the dev tools to get the URL) and visit that page - do you get any error?
You can also try changing an internal setting if you're getting attachment issues - open cache/xthreads.php, find:
PHP Code:
define('XTHREADS_ATTACH_USE_QUERY', 0);
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and change the number.
2. check for Javascript errors?
3. check your templates
4. same as point 1