Quicktime

Download and install Perian. This will allow you to open flash videos in Quicktime which will allow you to convert it to almost anything. ...

well just over 2000 clips which are either DV movie or quicktime movie files but we only actually imported about 6 or 7 home videos via my cam's digital link. ...

You are not paying attention to the files that you are trying to download. Their extensions are not .avi. Their extensions are .001, .002, etc. These designate the sequence numbers of segmented archives. You should download all of the files for each archive. Then use Stuffit Expander or The Unarchiver to join the segments.

Well you could be extra secure following the NSA guide to Leopard Security if you dare! :rolleyes: Now if you want secure email (like me :D) then you can get Email Secure signature. Like others (Mikuro) have said little snitch is worth the money because it actually shows you how many programs call home without your knowledge, then you can block outgoing connections at...

I exported a quicktime .mov file from a Keynote presentation at full res. iMovie won't let me drag it into the media area. I've tried to import from iTunes and iPhoto, too. ...

and other quickTime Preferences files. Then restart Safari and see if that works. ...

Yes. you are absolutely right. I use VLC and the MKV files I wish to play back are 720p. I have try quicktime 7.6 and it seems to be able to cache the file before I hit play. Quicktime work better but still choppy. ...

I still have the same problem after I restarted my mac

Are you running Snow Leopard? If so, have you tried opening the movie with the "Quicktime 7 Pro.app", located in /Applications/Utilities/?

In the folder /YourHardDrive/Library/Internet Plug-Ins/ are the browser plugins.