Magento Checkout problem - Onepage Checkout - repost

We've got an urgent problem with our Magento shop. Since yesterday Magento checkout doesn't work on IE and Firefox (possibly all others as well). There hasn't been any changes to config at all over last few weeks.

The screenshot attached is how checkout looks now - it's completely greyed out without any chance to progress past this page.

The issue has nothing to do with hosting - I need somebody to identify what is the problem and rectify it asap.

Beceriler: Grafik Tasarımı, HTML, PHP, Web Sitesi Tasarımı

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İşveren Hakkında:
( 3 değerlendirme ) Isidro Casanova, Argentina

Proje NO: #4396494



Hi, can I help you ?

1 gün içinde %selectedBids___i_sum_sub_4%%project_currencyDetails_sign_sub_5% GBP
(2 Değerlendirme)

5 freelancers are bidding on average £71 for this job


ready to start job, lets discuss ?

1 gün içinde %bids___i_sum_sub_32%%project_currencyDetails_sign_sub_33% GBP
(22 Değerlendirme)

Hello, Please check your PMB. I have applied for your job. Thanks

in %bids___i_period_sub_35% gün içinde103%project_currencyDetails_sign_sub_37% %project_currencyDetails_code_sub_38%
(7 Değerlendirme)

Hello, Please check your PMB. Thanks have a awesome day

in %bids___i_period_sub_35% gün içinde185%project_currencyDetails_sign_sub_37% %project_currencyDetails_code_sub_38%
(12 Değerlendirme)

Ready to fix the issue.

in %bids___i_period_sub_35% gün içinde23%project_currencyDetails_sign_sub_37% %project_currencyDetails_code_sub_38%
(3 Değerlendirme)