[Semediawiki-user] Strange error condition

[Peter B. <pet...@gm...>]

I'm at a loss with this one, and I'd welcome any suggestions. I've a
new installation of:

Semantic Bundle1.9.2
Semantic MediaWiki1.9.2
MediaWiki1.24.2
PHP5.5.22 (cgi-fcgi)
MySQL5.5.42-cll

It's hosted under cpanel. I've installed it from scratch a number of
times, because the error is so peculiar.

When I create a new template, with the form, with the default output
'Table', I get this error:

"
Forbidden

You don't have permission to access /za/index.php on this server.
"

For this URL:

http://itsmf.org.za/za/index.php?title=Template:Try&action=submit

However, if I click on the same form, but with either 'Plain Text' or
'Sections' instead, as the Output Format, it works perfectly.

What could be going on?