My computer information is: 
     Windows XP SP3
     Intel Dual Core 1.86GHz 
     2 GB RAM
Open Office Version: OOo3.0m5

When moving column separators, only the first line works as intended.

Steps to reproduce this bug:

1. Open a new project in Impress
2. Create a table (I do a 5x5, but table size doesn't matter as long as you have
more than 2 columns).
3. Click and drag the vertical line separating the first and second columns to
the right.  As desired, the first column gets bigger, while all other columns
stay the same size, and the table's width increases with the first column's
width. If you do the same thing except you move the line to the left, ONLY the
first column's width is affected (and the table's overall width), but no other
columns are affected.
4. Now do the same thing with any vertical line separator AFTER the first line.
 Rather than doing what the first line does, these separators just move to the
new location, changing the size of both columns that it separates, not affecting
the table size as it should.

I did this same test on all of the horizontal separators in my table, and they
all worked as expected in that when I moved ANY horizontal separator up or down,
the row immediately above that separator was the ONLY row affected, and the
table height changed based upon the change in that row's height.