My Dishwasher is Ruining My Dishes!!

Ok, so the dishwasher is over 12 years old, but I am still very disappointed in it!

About eight months ago, I switched from powdered detergent to the Sam's Club version of the Cascade Action Pacs. They seemed to work really well at first. Especially when I felt adventurous and used two pacs-- one in the Main Wash compartment AND one in the Pre Wash compartment. (Believe me, I did research to see if it was ok to use two. I like to "follow the rules." I could not find anything definitive so only did it when I was in a risk-taking mood.)

About three months ago, I switched to the Cascade brand action pacs. Well in the last two months, I have noticed that horrible white film on my dishes, especially the coffee mugs and glasses.

Do you think Sam's Club brand is better than Cascade or is this just a coincidence? Also, at first I was not putting additional rinse aid in, but since this happened I put tons in and maybe that is making it worse?

Does anyone have any suggestions for me? This is really getting on my nerves!