I used the Cleaner Tool, following all instructions, and the program launched but wouldn't play clips. I checked all capture, playback, and camcorder settings, downloaded updates to PPro 4.2.1, and rebooted computer but the program wouldn't capture HDV footage. I captured it via quicktime and imported that but the program still wouldn't play the footage. In the process of all this the program crashed and required relaunching probably at least 7-8 times. Also, the device control wouldn't work, sometimes saying "try resetting camcorder" or claiming it was offline when it wasn't.
Having used Premiere for 10 years and this version for 4, having learned innumerable workarounds and program quirks, and having important projects in progress with this software, it's going to be very tough to have to adapt to FCPX, but this has become a serious time sinkhole. I do appreciate the help of AB and others who have responded to forum queries over the years but as a professional I just can't afford to spend all this time troubleshooting. Editing programs are supposed to enable editors to get their projects edited.
If anyone thinks there might yet be a solution, please let me know.