Touring bikes come equipped with triple cranksets and they can be tempermental when it comes to shifting. That's because there's a lot of real estate between the smallest and the largest chainring, which can cause some pretty weird chainlines. Ideally, the chain should always form a line paralell with the frame so that it rides on the chainring without rubbing against the adjacent chainring.
In certain gear combinations, when the chain is on the largest cog in back and the middle chainring in front, (a no-no) for instance, the chainline gets so out of whack that during shifting it can get hung up between the chainrings and cause the chain to jam. This is not a good situation, it can even be dangerous.
Luckily there's a simple technique to avoid the problem of 'chain suck.' Before shifting the front deraileur, make sure to shift the rear deraileur so that the chain is riding in the middle two or three rear cogs.
To add life to your drivetrain and keep shifing smooth, use only the low third of the rear cogs while you're in the small chainring up front, the middle third on the middle chainring and the high third on the big chainring.
And of course, never shift when you're pedaling hard. That's just asking for it!