Just to let you all know, the tearing issues as seen when using an NTSC GameCube in Progressive Scan mode on the ZD26P are resolvable.
After I reported the
problem to Toshiba at the beginning of February, I've been in intermitment contact with a very nice chap called Nigel who is the UK customer relations manager. After them trying to reproduce it at head office and having no luck, they consulted the factory in Japan and arranged for the area technical manager to come and visit me.
He arrived this morning, whipped the back off my set, scared the bejesus out of me by making me think he'd broken it, took it apart quite impressively, added something somewhere and reassembled it all. Hey presto. Prog scan working with no tearing. Looks awesome.