tools:RGUI disappears from globalenv R -

i installed newest version of r os -- r version 3.1.3 mac. tools:rgui not load properly. half time, open r , search() not include tools:rgui. other half of time, appear disappears global environment. result, cannot use function or search , install packages. internet connection fine. ideas?

i think figured out problem; had detach() @ start of code. not attach data have been told bad habit can lead problems. right. have deleted references attach , detach , things seem work fine now.