You need to prove this is the way the developers are calling
the CSH and that is quite easy. See the article on my site Calling
WebHelp Using URLs and construct a link to a CSH topic using the
startpage.htm#path/cshtopic.htm method.
As it will be local, I suggest you open IE and go to File
> Open and navigate to the startpage. Use that as the startpage
part of the link you are constructing. Close IE, work out the rest
of the path and then reopen IE and use that path.
That should open the topic with the skin, TOC etc.
Now double click a CSH topic in Windows Explorer. It will
open with a Show link top left. Click that and you should see the
skin.
Assuming both tests have worked, then the problem with the
call from the application is down to the developers. I doubt it is
a bug, just something they have not got right.
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