Yeah, visual cues can be rellay decieving especially just starting out.
Fermentation is not always "dynamic," just because we don't see anything happenning, doesn't mean that anything's wrong, and also doesn't mean that the yeast are still not working dilligantly away, doing what they've been doing for over 4,000 years....
People with buckets usually only try to go by airlock bubbling, but Airlock bubbling, lack of airlock bubbling, stopped airlock bubbling, fast airlock bubbling, slow airlcok bubbling, heavy metal airlcok bubbling, or disco airlock bubbling really is not an indicator of what is happening to your beer. It is NOT a fermentation gauge, it is a valve to release excess pressure, excess CO2.
An as you can see from your craboy situaltion, even that is not necessarily a good "sign of fermentation."
Even if you have a couple point drop in gravity, it means it's working....Just at it's own pace.
More than likely everythign is fine....yeasts are not like they were when most books were written...they are much stronger than that these days. It's really rare for yest you buy to be "dead" or not working...and unless you put it in boiling wort, they take off on their own.
Keep us posted...