no1se

Finally I found out its a piece of custom code I added to functions.php which caused the issue. Now everything is working like a charm.

well, it has something to do with the following CSS
.entry-thumbnail img{max-width:100%;}

if I manually change the CSS code to the following kind, then the images finally appear.
.entry-thumbnail img{max-width:none!important;}

however IE9 dont work the way above… Im so desperated

browser compatiblity (specially IE series) is such a bitch.

Hi jameskoster, thx for your kind reply.
I tried out on a vanilla wordpress site and you are right. This code works just fine.
However Im trying to run the code on my another wordpress site which uses sphinx search plugin and encountered bad luck…
So this should be a compatiablity problem between plugins.
Still I suggest that you guys make a template tag which definitily works better than shortcode.
Thx anyway!

I solved the problem, its smth wrong with the wp-cache-config.php file, I donno why but its modified some how…