Comment 2 for bug 373409

I think I have the same problem. It resizes the partition, checks the file system, then tries to resize the filesystem to fit the partition. resize2fs gives an error, so GParted just gives up and doesn't try to fix the problem it created.

ubuntu@ubuntu:~$ sudo resize2fs -p /dev/sda7
resize2fs 1.41.4 (27-Jan-2009)
Please run 'e2fsck -f /dev/sda7' first.

ubuntu@ubuntu:~$ sudo e2fsck -f /dev/sda7
e2fsck 1.41.4 (27-Jan-2009)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Jaunty: 665315/4340752 files (0.6% non-contiguous), 16571397/17464655 blocks

ubuntu@ubuntu:~$ sudo resize2fs -p /dev/sda7
resize2fs 1.41.4 (27-Jan-2009)
Please run 'e2fsck -f /dev/sda7' first.