validate: validation and fullcalendar conflict

validate: validation and fullcalendar conflict

Hi,
I'm using validation plugin and others like fullcalendar; all is ok except one thing: it seems that validation plugin conflicts with fullcalendar plugin.
I explain better the problem:
I'm using jquery ajax http calls (GET and POST) and so I generate the content of my principal div by clicks on site menu. When I access to a page that uses validation plugin and after to one with fullcalendar this one doesn't populate with calendar events received with a JSON array. I load validation plugin in the moment that I use it with a getScript call. So it seems that when I've loaded the validation plugin this conflicts with the other; infact, if I refresh the page calendar returns to the correct behavior. Firefox console doesn't report any javascript error.
Have you some idea about which should be the problem?

Version information:
jQuery JavaScript Library v1.5
jQuery validation plug-in pre-1.5.2
FullCalendar v1.4.10

Thank you very much,
Lapo