We also have two Ortho Vision analyzers. We have been having issues with the IgG cards for a few months now. This is a nation-wide problem according to our Ortho Technician. and Account Manager. We've tried several lot numbers of cards, some with better results than others... Thankfully, we recently upgraded the Vision software to version 4.8.0 (Mod 16) and we are now able to edit reaction grades on the QC results after reviewing the cards. Before that, the QC would fail automatically and we would be forced to repeat the QC, sometimes 3-4 times.
I'm surprised by some of the comments of Ortho representatives denying that there is a problem. While they don't currently have a solution to the problem, our account manager and service technician have been very forthcoming that this is a known issue with the IgG cards.