This error, from Tcl, doesn't really make sense: ./testfixture: wrong # args: should be "R rebase CHANGESET" while executing "R delete" Could be a bug in the C code used to bind the sessions module API to Tcl, or could be some problem in Tcl itself. The bug report doesn't say which Tcl version is in use. Do you know how we can find out? 8.6.8 is a good Tcl version for SQLite testing. Dan.