[trunk] Inserted barline is missing

Setup: MuseScore trunk rev. 4180 running Win XP SP3

Steps:
1) load or create a score;
2) go to the Palettes, open Barlines and drag any of the barline types on a measure;
3) save the file;
4) close the file and reopen it

Result:
The inserted barline is missing in the score.

Note:
* I saved the file in uncompressed format (mscx) and noticed that the tag is missing in the measure section where I inserted it. It seems that the barline is not being saved in the file.