I'm sorry this has happened, SQ. It gums up the works really quickly.
I'll guess the IT department at the CU wishes it had never changed the software, too, but (not knowing what was behind the decision) it may not have been their choice. Software platforms get outmoded (especially in today's environment of constant cyberattacks), vendors go out of business or get merged out of business, and customer demands sometimes force changes (secure mobile clients, etc.).
Long story short, they may not have had a choice in the change. I'll guess the IT department is cussing out the software vendor fully as much as customers are. That doesn’t necessarily make things any better for you, but, having been through migrations similar to this, I'm pretty sure all hands are on deck right now and they are working to fix it and want it fixed as much as you do. I hope it's soon and seamless from here.