I think I have the solution for you.
To pause and unpause the game you just need to use the pause key, nothing else.
However, and this is a bit weird - your message/alerts settings may interrupt with pausing the game.
This is what you do: go to the Menu window and select options and Messages IIRC. In that window you can change how you should be alerted in different situations.
In more detail you can choose to have the info just displayed in the log or not at all and you can also select to have a popup window alert you and that popup window can be set to either pause or not pause the game. Are you with me this far?
All popup windows set to pause will actually _unpause_ the game if it was paused already. Get it? Amazing isn't it?
The solution is, therefore, to make sure you have no popups set to pause the game, because you can do that yourself anyway. Be sure to check that your changes were registered because you have to cajole the game a little to get it done.
There - wasn't that easy?
