Well, I ended up creating a Sybase tech support incident through our DBA, It turned out that this was a known problem with the current release of the 15.03 drivers, and they released a patch to fix it. After doing a clean install of the drivers and applying the patch, it fixed the problem with linking from Access to Sybase tables. Additionally, I found out how to make legacy applications work with the new drivers by using a script they provide to copy the new DLL's to the old DLL names. So, all problems are fixed and everything is once more right with the world.