Today, Fredo has released important updates to his scripts in which he:
fixed the bugs and would strongly advise users to upgrade the following scripts to their latest versions, all dated 6 May 10:
LibFredo6 --> v3.4c (the most critical)
ToolsOnSurface --> 1.6a
RevertCurve --> version 6 May 10
DxfTransformation --> version 6 May 10
MarkVertices --> version 6 May 10
In principle, you don't need to upgrade the other scripts (FredoScale, RoundCorner, HoverSelect, GhostComp, JointPushPull, BezierSpline, etc...).