Weird Problem - One word in Text giving me an error.

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I'm having a really weird problem with C5. I'm trying to enter text from a client into the homepage & I get this error message:
Not Acceptable

An appropriate representation of the requested resource /festival/index.php could not be found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

Now for the weird bit. I'm trying to add some text to the homepage. I've had no problem building out the other nearly 50 pages of the site but one paragraph of text seems to be giving the above error, & I've narrowed it down to one word in the second sentence:

The executive committee are currently selecting the shows for this Festival. To date the Festival Selection Committee has received a large number of applications from both international and Irish Societies who are to compete in Waterford International Festival of Light Opera.

It's the word "from". I've gone into the HTML view & changed it to read form & it lets me update but as soon as I go back in to edit, & change it to from, I get the error. Site is to go live today & I really don't want to have to publish with a typo.

Thanks in advance for anyone who can help.

PassionForCreative
 
tecnolord replied on at Permalink Reply
tecnolord
Hi,
It must be something that breaks your webpage. As you can imagine it is not the text itself. There must be something that breaks the coding of the page like missing quote or other non visible signs.

What is the url of the page?

what happens when you empty the text and only place the FROM word in the content block?
PassionForCreative replied on at Permalink Reply
PassionForCreative
Hi Tecnolord,

url ishttp://waterfordintlmusicfestival.com/festival/...

I've tried viewing the content in HTML mode & removing all styling etc. just <p> tags left, I've tried adding HTML of the text inside the <p> tags & the same error every time?

I'm flummoxed. I've gotten my copywriter to reword it without the offending word but it's bothering me why it wouldn't let me do it.
tecnolord replied on at Permalink Reply
tecnolord
its indeeed a strange problem.
as far as i can see (but i will continue too puzzle) its text that will be placed inside a DIV with class "HTMLBlock" and paragraph (P)
what is the css code for the htmlblock and P (if any) that block? (are there differences included for browsertypes?)

nice site! :-)
i noticed that the word "festival" isn't lined up properly (unless it has to be in a wave-form) at the top of the page...
DavidMIRV replied on at Permalink Reply
DavidMIRV
By chance are you hosting on a server with apache mod_security enabled? I've encountered several mod_security issues with the default rulesets..

Actually this sounds Exactly like mod_security. Its the anti SQL injection rules which are kinda still 'beta'ish
tecnolord replied on at Permalink Reply
tecnolord
SQL injection blocking... why didn't i think of that one :-) i recently installed a few of those on a windows platform.. with some good and bad results. I guess it behaves similar on apache servers when installed/active.
so it would block keywords used by SQL. (when submitting an URL)
It should not do it with "default" texts that are from the website, but beta'ish code possibly can interpret too much texts... (i am not a apache specialist, but i can imagine it is a problem)
How could this be made visible? does it show up in that php test script thing?