txtProgressBar suddenly stopped working with style=3 - r

Question

I've been using txtProgressBar() for a while now. Since today, it stopped working if using style=3.
It just shows an empty progress bar, and is not updated.
Yesterday I updated some packages, but not the utils package, AFAIK. Maybe the sysadmins updated R without me knowing.
To reproduce:
for (i in 1:10) {
pb <- txtProgressBar(max = 11, style = 3)
Sys.sleep(1)
setTxtProgressBar(pb, pb$getVal()+1)
}
close(pb)
In my case, this just shows:
| | 0%
All the time. Other styles (1 and 2) work fine.
My R details:
> R.version
_
platform x86_64-pc-linux-gnu
arch x86_64
os linux-gnu
system x86_64, linux-gnu
status
major 3
minor 2.2
year 2015
month 08
day 14
svn rev 69053
language R
version.string R version 3.2.2 (2015-08-14)
nickname Fire Safety
Is there something I'm missing, maybe something that could be wrongly set in my session, or is this a bug?

Answer 1

You put pb <- txtProgressBar(max = 11, style = 3) inside the loop. It should be outside the loop, before it.
Also, your max is not correct. It should be 10, as your for loop goes from 1 to 10.
pb <- txtProgressBar(max = 10, style = 3)
for (i in 1:10) {
Sys.sleep(0.5)
setTxtProgressBar(pb, pb$getVal()+1)
}
close(pb)

Answer 2

the following part of the code: pb <- txtProgressBar(max = 11, style = 3)
should be outside the for loop. In my interpretation, if you put it inside you re-initialize the progress bar at each cycle of the loop.
The following code does what you are expecting:
pb <- txtProgressBar(max = 11, style = 3)
for (i in 1:10) {
Sys.sleep(1)
setTxtProgressBar(pb, pb$getVal()+1)
}
close(pb)