Maintain Baseline java.lang.String cannot be case to com.primavera.commone.value.ObjectId ERROR

We are on P6 8.1 using Optional Client + Web Access

We get a SEVERE error in the Update Baseline Application Log as follows... any idea as to what may cause this?

2011-09-08T07:58:22 INFO Options file: C:\Documents and Settings\user\Local Settings\Application Data\Oracle\Primavera P6\P6 Optional Client/appdata/UpdateBaseline.P6admin.PMDB

2011-09-08T07:58:22 INFO Run Optimized: true
2011-09-08T07:58:22 INFO Updating Baseline: Digitization Program - B1
2011-09-08T07:58:22 INFO Updating General Project Data
2011-09-08T07:58:22 INFO Updating Project Code Assignments
2011-09-08T07:58:22 INFO Updating Project Notes
2011-09-08T07:58:22 INFO Updating Project Funding Sources