Last fall when ABC first started sending HDTV to the affiliates, there were all sorts of problems. I wrote to WPVI, and they blamed ABC for the problems. Now, toward the end of the season, I'm still seeing the same sorts of problems.
Continual "late flipping of the switch" is one big problem that happens frequently.
Also, those damn green flickering horizontal lines are STILL there.
Not to mention, breakups, pixellation and freezes that happen all too often. This is NOT caused by my installation, it is clearly happening at the source or at WPVI.
Unfortunately, I find myself switching back to standard cable for many ABC shows. While I think ABC's effort to get into HDTV is admirable, and clearly puts them ahead of what NBC and Fox are still doing (Fox? or yeah, Fox "widescreen" -- what a joke!!) But it seems that the effort is half-hearted on the technical side, and I don't know for sure if it's really ABC or WPVI where the problem lies.
I hope they get their act together before the start of next season.