Well, the tweaking continues as described in another post. Re-implemented the Herman-TLV maneuver last night, adjusted electrical focus, then turned the CRTs around (after gentle cleaning with lens paper) to better adjust mechanical focus. Reset gray scale and touched up convergence. Problem is, now whenever my RP-91 is in progressive mode (in either HD input) the TV immediately turns off, leaving me staring at a blank screen and blinking red power light. When I unplug and replug the set and turn it back on, it is in 4x3 mode. I have read elsewhere that this is an automatic reset mode that occurs whenever anything goes wrong in the set. I also read that this may at times be due to CRT arcing, due to dropped phosphors or dust in the tubes, which is entirely possible since I had to move the CRTs to turn them around! My concern is that this only happens when the Panny is in progressive mode, not interlaced. Does this sound right to people? Could something else be at play here? Thanks!