Infinite loop caused by require(gWidgetstcltk)
===

When I `require(gWidgetstcktk)`, I get an infinite loop, with a seemingly endless number of error messages that look like this:

    error reading package index file /Library/Frameworks/R.framework/Versions/2.14/Resources/library/tcltk2/tklibs/ttktheme_clearlooks/pkgIndex.tcl: can't find package tile
    error reading package index file /Library/Frameworks/R.framework/Versions/2.14/Resources/library/tcltk2/tklibs/ttktheme_clearlooks/pkgIndex.tcl: too many nested evaluations (infinite loop?)

(On each iteration the path is different. The end of these messages seem to be the important parts: `can't find package tile` and `too many nested evaluations (infinite loop?)`

I installed the packages as usual using `install.package()` and the files referred to seem to be present. `gWidgets` seems to load just fine. What is going wrong here?
     