iprofit

Hi All, I'm new to PrestaShop and to the forum. I like PrestaShop very much, but now I have a big problem with delivery methodes and if I can't solve it, I must choose another free ecommerce system. I'm using default bootstrap theme and after modifying global.css, delivery doesn't work. I made 3 tests and if I modify for example only a single background colour in global.css, shipping methodes disappering and I get an error message on the order page. (In English something like that: "We are not able to deliver.", site is in Hungarian.) Since I have recognized the problem at the first time, I made tests after all changings, so I think, problem is caused by css modification not by a module installation. I have restored original global.css (copied from a new installation), but it didn't work. I have tried to delete shipping methodes and create new ones, but it didn't help too. Site is under maintenance, but I have attached a screenshot on the order page. Had anybody a problem like that? Any idea what I could do? Thanks in advance, Christie