It is version 8.6 so I believe it is the most current. Bridge can't view them either
Something must have gone kablooey in the process. Did you try uninstalling everything and reinstalling?
Is this a Rebel T5i? Canon's site has an update to Digital Photo Pro which works with RAW (but you must have an install of that program or the CD-ROM with it on there handy).
If in photoshop cs4 you go Help>About Plug-In and click on the words Camera Raw, what version does it say?
Check both the 32 and 64 bit versions of photoshop cs4.
I just tested a couple of canon T5I (700D) files from here and they open in photoshop cs4 with camera raw 5.7 after the dng conversion using the 8.6 dng converter.
(under sample raws at the bottom of the page)