where to start?

you are serving cached pages… for w3tc, you must tell it to not cache the wp page the forum is on for all caching types in use….  you have page caching off, but others are in use… minify js would cause this issue…

also, you have some serious jquery issues…

something is loading an external jquery version:

<script type=’text/javascript’ src=”http://www.somosguatemala.com/wp-content/plugins/wp-lightbox/js/jquery-1.8.3.min.js?b30adc”></script>

that looks like the lightbox plugin… its a different version from what wp comes with…  much older

additionally, it will conflict with the version wp loads later…

<script type=’text/javascript’ src=”http://www.somosguatemala.com/wp-includes/js/jquery/jquery.js?b30adc”></script>

for more info, see:  http://codex.simple-press.com/codex/faq/troubleshooting/what-is-this-jquery-conflict/

Should i just go and delete that <script type=’text/javascript’ src=”http://www.somosguatemala.com/wp-content/plugins/wp-lightbox/js/jquery-1.8.3.min.js?b30adc”></script> ?

That’s not really a good way of doing it. It actually needs to have the code changed to properly use the WordPress functions. Before we do that can I ask if this is the most up to date version of this Lightbox plugin? I haven’t come across it breaking the rules before as far as I recall.