Page 1 of Philips DVDR family - no play DVDR DL

Has anyone came up with a fix for the Philips DVDR family of DVD recorders to play DVD+R DL disks?

I burnt films onto Reitek DVD+R DL disks and then onto very expensive Verbarum DVD+R DL disks and found the following:

Philips DVDR 70/ 75 and 77 machines will play none of them. Just reports a disk error.

Cheap Black Diamond, 100 quid Philips player, 3 year old Panasonic player will play DL disk perfectly.

So why can`t the Philips DVDR family. (Already updated to the latest version of s/w: 6.3).

I wrote to and also rang the Philips technical helpline asking if this is a software or hardware issue. And if it is software, would they be releasing a new s/w to fix it.

They hadn`t got a clue what I was talking about. "Most retail disks are DL and can be played" is all they said over and over. And they when I asked if they had anybody that was actually technical, they said that they could not follow up any further on my inquiry !! $%^&* !!

After paying quite a bit of money on the recorder I though that it would at least play all formats of disks...........