"Interlaced" frames export problm in 5.1.4

I've recently updated to 5.1.4 and now all the exports (via FCP QT movie, Compressor or QT conversion) shows a "banding", like a still of interlaced video in a NTSC Monitor, plus 3 very big lines across the image (horizontal, all of them).
I've been exporting the same sequence with the same settings from 1 week to date and burned it to DVD without any trouble. The only thing changed since last successful export was this 5.1.4 Update.
Of course I've tried to downdate to 5.1.3 but it seems that the page has some problems with the link. I've also searched in the System Library for the receipt of the update to FCP 5.1.3, but it seems to be deleted.
A solution or a link to 5.1.3 would either be VERY appreciated.

Thanx in advance

Mac Pro 2x2.66 Dual-Core Intel Xeon/3GB RAM/X.4.8/FCP 5.1.4 Mac OS X (10.4.8) AJA KONA3/HUGE 4110 1.2TB/SATA RAID 1.2TB

Mac Pro 2x2.66 Dual-Core/3GB RAM/FCP 5.1.4 Mac OS X (10.4.8) AJA KONA3/HUGE 4110 1.2TB/SATA RAID 1.2TB