How can I get Skype to show all chat messages on the left?

I have a problem with the horizontal alignment of chat bubbles in Skype. I am using Skype on various computers. So far all Skype installations have shown messages aligned to the left (chat partners messages on the very left, my own messages also left but indented a bit). Some what like this:

|Their message                        |
|  My message                         |
|Their message                        |
|  My message                         |

Now one Skype installation (on a Mac) shows my messages aligned to the right. Somewhat like this:

|Their message                        |
|                           My message|
|Their message                        |
|                           My message|

Could this be caused by some language settings? Is there a way to avoid that?

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