It sounds likely that there is a seal leaking, on older 900's there are a lot of things that can potentially make this happen. Most likely it is going to be the slave cyl, especially since it sounds like there is a disengagement issue. Was the slave cyl that was installed a genuine saab component, or was it a "scan-tech"? Also, it is important to be very careful when installing the clutch to not beat the slave cylinder up.
If it's not brake fluid leaking onto the clutch from the slave, it's probably either the "rear" main seal, or the input shaft seal. Don't discount the secondary sources though. A leaky distributor, distributor O-ring, or the front engine cover can get trace amounts of oil onto the clutch. You want NO oil or brake fluid getting on the clutch, which I'm sure you know.
If it's not brake fluid leaking onto the clutch from the slave, it's probably either the "rear" main seal, or the input shaft seal. Don't discount the secondary sources though. A leaky distributor, distributor O-ring, or the front engine cover can get trace amounts of oil onto the clutch. You want NO oil or brake fluid getting on the clutch, which I'm sure you know.