javascript issue on joomla site

Hi all. I have created a joomla website and have an issue which I can't fix. I'm looking for somebody to start immediately and help me fix this issue. I can guide you through my thoughts on the issue so far via skype. This is the problem: the website works flawlessly except for a search which filters results. It seems to only filter results for guests - not for logged on users. I suspect it is a javascript issue as I can get the filter to work when I remove a plugin which combines javascript files to enhance page loading. I need someone who knows joomla and is keen to help sometime within the next hour. Thanks in advance.