Congratulations on having the baby!
What I meant was the camera should function properly whether in live view or normal viewfinder photography. And that if the problem presents itself even once it will be back if it is in the camera its self and not the card.
I have heard of bad card readers messing up a good card but usually after formating the card (choose low level format in the camera at least once while troubleshooting) The camera and written images should be looking fine in playback on the screen.
I suggested buying a very cheap card as it would help troubleshoot and having an extra even small and slow card is a nice thing to keep in the glove box, coat or purse as it is so easy to travel to a photographic location and to forget your best card at home. Here is
such a card for $17 its a decent spare.
Although you may very well not be in the market for a card reader I will point you to a good one. Here is a very well regarded CF SD Card reader, my personal choice, its $32 but
excellent Lexar brand.
If you can not get the 7D to behave most likely given plenty of daylight your cell phone will generate some very good images in the meantime.
I hope it is the card or card reader. I dig about a new body not being in the cards. You may very well know all this but I will throw down a few words anyhow. Although it is just opinions and not hard facts.
If it does end up being a costly problem and you eventually buy another camera here are a couple tips.
Ebay and
Fred Miranda forums are the best markets for finding good low milage gear at good prices. I bought one 7D on Fred Miranda with less that 3000 clicks for about $475 US and sold it a year later this last fall for about $465 on ebay.
Add the word shutter to your searches and you will quickly find the lower shutter count and less beat up cameras no matter the brand or model. A 7D or 7D II with less than 60k clicks is worth $600 to me. I would think any Canon body with less than half its rated shutter life count is only about 1/4 of the way through its life. But as you know shutter and mirror boxes are not the only thing s that can malfunction.
T4i on up ( here is an example of one for $365 out the door with less than 8000 clicks, smaller viewfinder and slower than 7D but has a rotating touch screen), 70D on up and 7D on up, and 5D II on up are as old as i am considering and I am currently looking to replace my 7D I sold for xmas money right now. Going with an imported or refurbished 80D in April most likely.
Wish I could of been more help.