Well, your version is fairly old (almost 2 years). There have been a few changes (bug fixes, improvements, etc) in Limesurvey since then.
I think it doesn't make sense to try to find out if this is a bug or not, because it might have been fixed long ago. So the first thing you should do is to update to the latest version of the 2.0x branch.
You could also update to 2.5x branch, but this is quite different. So before you update your installation to this, you should install a test version and check it thoroughly if it works for you. Only then update to 2.5x branch.
Or maybe what you could do is check on the demo here if it works. This should run a fairly up to date 2.5x branch version of LS (I just see that it is 2.51.4, which isn't actually very old, but there have been a few changes).
I think it doesn't make sense to try to find out if this is a bug or not, because it might have been fixed long ago. So the first thing you should do is to update to the latest version of the 2.0x branch.
You could also update to 2.5x branch, but this is quite different. So before you update your installation to this, you should install a test version and check it thoroughly if it works for you. Only then update to 2.5x branch.
Or maybe what you could do is check on the demo here if it works. This should run a fairly up to date 2.5x branch version of LS (I just see that it is 2.51.4, which isn't actually very old, but there have been a few changes).
