Here's the steps to reproduce the problem.

1. Click "Insert Templates"

2. Click button for making new template above the view box on the right

3. Make a table

4. right click on the table and click table properties

 

You cannot click ok because the window is too small to show it... :(

 

The pop-up should be made resizeable  or at least big enough to display all the controls the cute editor may show...

 

Here's a pic showing the ok/cancel buttons not showing for the table properties...

If it matters I'm using Windows XP SP3 and Firefox3.0.11