error in lmerTest after updating to R 3.3.0

Dear all,

After updating to R 3.3.0 (inadvertently, via apt-get), I get an error 
when using lmerTest. Here is an example:

library(lmerTest)
library(MASS)
data(oats)
m <- lmer(Y ~ N*V + (1|B/V), data=oats)
summary(m)

summary from lme4 is returned
some computational error has occurred in lmerTest

I have removed all old libraries and tried to have as clean an 
installation as possible, but this did not fix the problem.

Is this an incompatibility or a problem with my installation?

Thanks for your help

Pascal