I have just tried again.
This time I downloaded & used the other loader program mentioned in one of my previous posts (KRYPTVIEW_AmEt_Loader.exe), although it is the same version as the one I was using previously. I also downloaded the file again. This time I used firefox to download them, just in case the file was being corrupted by IE9 (clutching at straws, but I had previously had problems with corrupt files using IE).
I flashed the box with an old file so that I could set the box to Default (clutching at straws again!) before flashing with the latest file.
Flashed with the latest file. Went through all the normal proceedures, & finished with the front panel staying blank.
Went & had some lunch. Came back 15 minutes later. Still blank front panel & screen. Turned box off & on. Single green LED on front panel & no response from remote or front panel buttons.
Using a Windows Vista Home Premium 32 bit pc with a real RS232 connector.
Unfortunately, I don't know anyone else with one of these boxes.
It would be interesting if someone who has used this download could post here & confirm that the file is OK. I was beginning to think that maybe the upload was corrupt, as, like I say, all previous files have flashed with no problems.