Yesterday, I tried to link my gretl data with R-Studio sesion and all was OK.

It was gretl 1.9.15 cvs 13/04/2014 with R.3.0.1. I used the GUI,  Tools>>Start GNU R. (in my case the path to R-Studio)

However, this morning, after updgrade my R to R.3.1.0 the data starts to experience a strange behavior. For example, a data of 36497.60 in Gretl is opened in R as 68; 39187 as 76, and so on. 

I have changed the path to R instead of R-Studio and there is the same issue...