[Plugin: List category posts] Styling lists – only works in parts with thumbnails

please post a link to your site.

could be:

ul.lcp_catlist { ... }

try to work with a tool such as Firebug to evaluate the involved css.

ist so wie ich gesagt hatte: ul.lcp_catlist

(.lcp_catlist` is a css class of the ul tag)

try and use (for the second link):

ul.lcp_catlist li {list-style-type:none;}

(the li is needed because the theme used the list-style on the li)

and for the first link:

#content ul.lcp_catlist li {list-style-type:none;}

(because the list style was more specific defined by a #content ul li style)