this site has been running fine for months, i am not aware of anything changing until all of a sudden no sales for 3 days, test of the checkout and it hangs after confirm purchase on paypal or sagepay payment options. other sites on same server also using vmuikit are fine.
so in attempt to fix i have updated:
VM to 3.0.16 from 3.0.18
updated joomla to 3.6.2
updated Vmuikit to 3.2.5
but still it is the same in checkout.
i can probably get a backup from 2 weeks ago but this will be a big problem to revert to and obviously may happen again.
any ideas what might be causing this please?