Updated to WordPress 3.1.3

We have used WordPress 2.7.1 long time. It was stable because we do not have extra features needed. We updated to WordPress 3.1.3 just because we do not want to miss too much but should follow WordPress new version.

Most of stuff looks OK after we updated, the only one problem was the database backup plugin did not work well, but it was not big trouble, we just tried to update the plugin first, and it still could not work, we then deleted it and install again, then everything is OK.