A family of Microsoft relational database management systems designed for ease of use.
VC,
You say the problem only occurs with some files. Is there any common element in those files where it does occur (e.g. file size, custom formatting, custom views, etc.)?
Here's a couple of things to try,
First, try the Task Sheet view (if you haven't already). The Task Sheet view is the same of the Gantt Chart view but without the Gantt graphic. Is the excess white space still there when you print preview the Task Sheet view?
Second, save the file as XML and then re-open in Project. Note: you will lose custom formatting. If the problem goes away, the file probably had some corruption and this process cleared it.
Third, on a copy of one of the files where the problem occurs, delete half the tasks and see if the extra white space disappears. If not, half the file again. See if you can narrow it down to a small sample.
Since hotfixes, either individually or in cumulative updates, are not fully tested I don't normally recommend that users update to the latest. However, if none of the above helps, you could try installing the latest cumulative update which is June 2013. You can get it at, http://technet.microsoft.com/en-us/office/ee748587
John