Can't play videos in iphoto library anymore, why?

I'm running OS 10.6.8 with iPhoto 7.1.5. Nothing has changed with my camera and codecs that the Canon uses. I was previously able to play videos in iphoto. I think quicktime was linked but this is no longer the case. In order to play them I have to export as an original to the desktop and open the file via quicktime. This seems ridiculous since it worked before. What have I done? .....or what has Apple done? Thanks for your help.

How can I help?
Remember: we cannot see your machine. There are 9 different versions of iPhoto and they run on 8 different versions of the Operating System. The tricks and tips for dealing with issues vary depending on the version of iPhoto and the version of the OS.  So to get help you need to give as much information as you can. Basic things like :
- What version of iPhoto.
- What version of the Operating System.
- Details. As full a description of the problem as you can. For instance: 'iPhoto won't export' is best explained by describing how you are trying to export, and so on.
- History: Is this going on long? Has anything been installed or deleted?
- Are there error messages?
- What steps have you tried already to solve the issue.
- Anything unusual about your set up? Or how you use iPhoto?
Anything else you can think of that might help someone understand the problem you have.
Posts that consist of "iPhoto doesn't work. Help" or "iPhoto won't print" or "Suddenly I have no photos!!!!!!!!!!" mean that any helper is simply guessing. More information means you get better assistance.

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