URGENT! K2 store wont work on three different installs

I have been working on this for four days...I installed and redeveloped the site three times and it will not work. It lets me add attributes etc but I cannot get to the cart or checkout pages it takes me to a blank page. I followed all the steps from k2store.org and none worked including uninstalling and reinstalling dropping the phpadmin tables the whole nine. This site was due today and I am stuck...Please please help!

Using joomla 2.5 - black and white template latest updated version and latest k2 store 2.5.1 - it worked once upon install and now it wont work. The last option was to switch to a different template and when I try it on beez it works just fine but not on this template..

Please advise..

if url needed I will send it via email or pm

Please install clean Joomla and test the k2store, probably this is only extension problem not the template so this is not proper forum to get help. K2Store as a 3rd party extension is beyond our support, if the problem occurs on default Joomla template you should contact with k2store developers.