Some payments won't post to our invoices

Since the new release, we've had 5 instances,3 checks and 2 credit cards, where the payments won't post to the open invoice.  Instead, we get an "unexpected error has occurred. Please click here to notify support and provide your contact information."  Has anybody else been having this problem?  I've checked for commonality between particulars of the customers, invoices, and sales orders with no correlations within or between them.  Most of our payments post as they normally do.  I've opened up a case in NetSuite support, but the person on the problem hasn't been able to come up with a solution