Here is my example.
In my RStudio, I only see 50 columns at once. The problem does not occur if I want to sort one of the first 50 columns. But after switching to the end of the data view (using >>) ordering and filtering does not work anymore. It seems to be a bug in the RStudio IDE.
mtcars2 <- cbind(mtcars,mtcars,mtcars,mtcars,mtcars)
With mtcars2 I can reproduce the problem.
Silke
