What do you mean by getting a blank page ?
Is it just the main area of the template which is blank ? Or the whole page?
If it's just the main area, it's likely to be because of a setting somewhere. In that case, could you give a link to your shop so that we can see the problem ?
If it's the whole page, it means that there was a fatal error on the page which stopped the processing. In that case, we will need you to activate the display of errors by turning on the display_errors option of PHP in your php.ini file so that we can see where the problem comes from.