These problems have been fixed in version 2.0.5a-1. We recommend you upgrade your samba packages immediately.
Please note that this is a major upgrade so please be careful when you upgrade since some changes to the configuration file might be necessary. The configuration file also moved to a new location (/etc/samba).
The smbfsx package is also obsolete with this update and has been replaced by smbfs, which can handle both 2.0 and 2.2 kernels now.