GST affected when turning off online payments

WARNING: I turned off online payments last week and now all the invoices that were open at that time are showing incorrect totals. For some unknown reason, turning off online payments affected the GST so now all the invoices (over 80 of them) are showing the GST exclusive amounts rather than the GST inclusive amounts (even though GST inclusive is ticked and I didn't change anything on the invoice except to turn off online payments). When I reported this to MYOB I was told not to do anything with the file until they figured it out. It has been a week now. MYOB has escalated the case and is now saying it is a known issue and other people's files are also affected (those who also turned off online payments). Just want to warn anyone that turning off online payments may render your entire file useless and unusable. I haven't been able to record payments on invoices or create any new ones for a week. They don't seem to be able to give any indication on when this will be fixed. I don't know how I'm going to do my BAS.