A major regression slipped into yesterday's release 1.12.0 of pROC. The fix of issue #25 allocated a matrix which could quickly become very large for bigger datasets, and cause significant slow downs as the machine allocated the memory, or even crash pROC with an error message such as cannot allocate vector of size ... for larger datasets. This bug (issue #29) is fixed (and now automatically tested for) in pROC 1.12.1.

Please update your installation by simply typing:

install.packages("pROC")