ColVis questions: opens but cannot close the column list, doc for grouping columns, fnRebuild crash

Great program, thanks! This morning I upgraded to ColVis 1.1.0-dev from the nightly download (I did this to fix Uncaught TypeError: Cannot read property 'msie' of undefined per discussion 13805). Now I have 3 issues:

1) you can open but not close the column list with the checkboxes

2) In the downloads/colvis/nightly/notes link you mention "Update docs with link to 'Grouping Columns'", tantalizing, but I can't find doc, can you please post the link?

3) ColVis.fnRebuild( oTable );
crashes with message Uncaught ReferenceError: ColVis is not defined
Details: in my prior code, right after the point where I initialize DataTables on my table, I list several invisible columns e.g. oTable.fnSetColumnVis(13, false ) and then I have the ColVis.fnRebuild( oTable ) statement. After I upgraded and got the crash, I commented out the fnRebuild. The table renders properly (hidden columns are not shown). Should I be concerned that 'ColVis is not defined'

Thanks