I just did the 1.6.3 update and one of my themes doesn't show any images, it shows like the default layout and not what it suppose to be looking.
I already did the Template Editing required in the update, but no luck.
Image of page here,
http://imm.io/53bC
So what now?
Your actual URL would be helpful.
I just got it fixed, just a little type when editing templates
I have same problem.
There is a problem with CSS tag.
If I run upgrade.php, then my theme using default CSS.
In source I find
<link type="text/css" rel="stylesheet" href="http://www.vcelarskeforum.cz/cache/themes/theme1/global.css" />
If I update manually templates, then theme is OK.
In source I find
<link type="text/css" rel="stylesheet" href="http://www.vcelarskeforum.cz/css.php?stylesheet=12" />
Go and edit the "global.css" stylesheet for your theme. Don't make any changes, just save it.