LibreCalc problem in 15.10

In LibreCalc under Ub 15.10, I ran into an problem - when I did a standard copy-paste or cut-paste, a dialog came up like I was importing something, and when pasted, formulas, Idea, format was lost. It's bizarre - it won't paste formulas, format Idea - just a conversion to text.

I decided to see if if it was like that in a Ub Studio 14.04 o/s I had installed. Using the same Calc version and same spreadsheet it worked as it should.

I guess it's a Ub 15.10 problem.