Critical Bug Fix 2.6-6.1 on CRAN

Internal C function had a "protection error" which could crash R in unpredictable and non-repeatable ways: Function could run quite normally hundreds of times and then crash. The C function was used in several R functions, and errors could occur, e.g. in envfit (especially vectorfit), wcmdscale, capscale and varpart of Chi-square. The release is identical to 2.6-6 except for this bug fix. You should absolutely upgrade.