What you are looking at in the first few pics is the end cap for one of my T12 72" actinic bulbs. This all started a few weeks ago, probably while I was away from home, and I have just now resolved the issue. There was no warning, or alarms, in fact the light still worked for a week after it started, I just didn't know what was happening. All of the damage was contained within the endcap, while I was placing blame on my IceCap ballast. This should be a reminder for everyone to check the simple stuff before going to extremes. In hindsight, I'm fortunate that the house didn't burn down.
I never did find a definate cause, so I am left to assume one of two possibilities...
1. a faulty end cap (not likely, these things are fairly simplistic)
2. during the last bulb change, the prongs were not "fully" seated, thus maybe arching (more likely scenario IMO).
After sending the ballast back to IceCap, which btw...they were very honest, freindly, and helpful people, and having it returned checking out fine, I finally found the culprit. I ordered a new end cap, replaced it, and problem seems to be over with. Now I just can't sleep sound at night, worrying over every little smell or sound in the house