The RME HDSP 9632 is now quite an old card, but even more importantly, the PCI interface standard is quite old, and although RME provide stellar support for everything they’ve ever sold, there have to be limits to what is still viable.
Of course you are correct to question why your particular issue only surfaces when you change from WL 9.5 to WL 10, but there are so many other factors at play here, such as Intel driver support for PCI, Windows handling of PCI etc. I myself use an RME RayDAT with PCIe, and I have encountered surprise amongst colleagues who now only use USB3 or Thunderbolt, but whereas PCIe still has rock-solid support, older technologies such as PCI and Firewire are likely to become ever more problematic.
All I’m saying is, perhaps it’s time – for both of us – to investigate newer kit. Personally my next interface is likely to be AVB-based, rather than Thunderbolt, and MADI is overkill for me, but essentially I’m watching RME to see what direction they take, and that will inform my decision.