We’ve disabled all BE modifications, enabled default theme and now product page returns an error. Once we disable the Sales Motivator, the product page opens up again. There should be some problem with this extension – you have either not installed it correctly or there is some bug in the extension itself. Our advice would be to check the extension developer again and tell him that his plugin does not work with the default theme either.
Once he manages to fix it we will take a look at the integration again.
Unfortunately after we tried to activate BurnEngine again, your website is completely inaccessible. Maybe you will need to make a new clean install. BurnEngine modifications can be still exported though.