Hello,

I've already seen such an issue, and it was due to another extension conflicting with the Joomla form validation script used by iCagenda.

Do you have an online link available to the form ?

Regards,
Cyril

You can send me a frontend access at info(at)joomlic.com, but do you have check other extensions as i've already suggested ?

Thank you to check first if there's no conflict from another extension (plugin, template, module...), as iCagenda is using core login system and access control.
Regards,
Cyril

Hello,

So the issue is with the plugin : System - jSGCache
This one returns a jform validation error in jquery.

The solution for this plugin (i think provided by Siteground ?) is to disable it, or to exclude the url to the form (as i've done directly on your admin side )

So, now, the validation control of your form is ok! (the conflict of this plugin is with joomla validation script... don't know why, but maybe to be investigated...)

EDIT : well... this plugin doesn't do the job to exclude forms, so you have to edit the url option for dynamic content (forms and every dynamic content... ) : www.siteground.com/tutorials/supercacher...gcache.htm#blacklist
For SiteGround customers, with the same issue, check if an update exists for jSGCache to exclude forms (JForm), or please, report this issue to your Hoster SiteGround.

Best Regards,
Cyril

Thank you so much! I did not even realize that Siteground had included this plugin with their install.

Yes, and it's good to know, because all extensions using forms seems to have the same issue, so don't know if siteground has already updated their plugin to manage this or not, but with options settings, it's possible to exclude form pages

Best Regards,
Cyril