Welcome to the forum Angel5194!
Sorry to hear about the Ruby Heirlooms! I haven't heard about issues with the VeggiePro itself, the company is discontinuing this model because it's streamlining its products from about 26 different machines down to 6.
A number of members have had problems with the Ruby Heirloom kit though. From your description, it sounds like your tomatoes have blossom end rot (BER), but a picture would help confirm that.
It's normally caused by a lack of calcium, which can happen for varied reasons in a hydroponic environment: uneven watering, too weak a solution, too strong a solution or an incorrect pH....
I've read that you can let BER tomatoes grow and just cut out the bad parts, but most members here take them off the plant so that all of the energy goes into growing good tomatoes.
Whether you have BER or not, members switching to liquid nutrients have had improved results. My guess is that the AG tablets are not strong enough to properly feed these large plants.
About posting pictures, the forum instructions are at "
http://www.aerogardengrowers.com/index.php/topic,34.0.html". Most of us use an external image hosting service - I use Google Picasa - but you can also upload pictures under 'Additional Options' just below the box when you're typing a post. If you have problems, please ask.

Hopefully you can get your tomatoes back to health. I currently have some buds dropping from mine and will likely be switching to the GH three-part Flora series. It's used by a number of members on the forum and seems to be good.