You are right in not being concerned about the TA--it's not going to be an issue for you in this pool unless you have a high calcium reading.
The tabs are stabilized, but I still am not sure about the granules--dichlor granules ARE stabilized, cal-hypo granules are not. Either way, you'll need to watch your stabilizer level (and I'm sorry to tell you , but strips are not going to be accurate enough to depend on) and raise your chlorine level as your CYA level rises (see the "best guess chlorine chart in my sig above for more explanation). Sounds like you just have something, maybe an algae bloom trying to happen, eating up the chlorine. I would shock the pool by bringing your chlorine up to 12-15 ppm and holding it there until you can test at night and again in the morning and not lose any chlorine in the meantime. Once you do that, you should be able to maintain some chlorine in your pool.

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