I have a fully upgraded 7500 with all of the current OS and exts, and disc optimized. I also use a minimum extension set for DV.
Using a Sony PC100, I have no problem capturing full frame DV in iMovie, EditDV UP, and Premiere LT. BUT, I cannot get anything to record back to the camera but blocky images and sometimes a few frames - and then only using EditDV.
I've been search for month's with no luck, and tried all of the usual problem soving techniques.
Does the video card play a role?

What Firewire card are you using? I have a Radius (Digital Origin) card in my machine, and it is very finicky about Firewire driver versions. I believe 2.2.2 is the latest version that will work reliably.

This is in a 7500... umm... with an 8500 logic board and a G3/300.

Below are the specs. I have tried FW2.2, 2.3, 2.4, and 2.5. V2.5 solved a FW HD problem, but not the DV.

PPC 7500
OS: 9.0.4
Ram: 196 mb
PowerLogix G4/350 U/G
OrangeLink FW/USB PCI card
Sonnet Tempo Ultra ATA PCI card
Xclaim 3D PRO video - main monitor, 15"
Built-in video - monitor 2, 15"
HD - IBM 20g Ultra ATA
Extension Set: bare minimum: basic Control panels, QT, Rad ext's, ATI ext.
Media Volume optimized

It's the Temp Card. IDE cards in older macs often have problems with DV or just about any other high datarate multimedia files.

I agree with Sondjata, it's the Tempo Card (or TurboMax66, or Acard/66: it's always the same card). On pre-G3 Mac this card can't be used for audio or video use. I had the same problems with a PM9500+G3/250, Orangelink firewire and turboMax66 with Maxtor 40 Gbyte Ide disk.
To verify this, try exporting to firewire a short Dv movie from your internal Scsi disk...

Thank you for your comments. Sonnet agrees. They said that audio and video playback is a known issue that they are working on.

Now I have a reason- what is the alternative? I'm now left with a 20G Ultra IDE that I need a driver for.

Thanks, again. Anxious to hear. Bob

I don't completely agreee that your problem is just with the sonnet card. I've had the same problems and I've got an S900 with the following specs:

OS9
Quicktime 4.1.1
Firewire 2.5
XlR8 G400
224 RAM
Initio Miles UW SCSI card - 2nd slot
Several UW drives of varying sizes - IBM and Quantum
FW Depot Firewire card - top slot

Trying to export to a canon GL1.

After optimizing the drives I still cannot export video to tape without blockiness, jerkiness, audio won't sync with video.

Using FCP and Premiere 5.1 yeild the same results. Reducing extension set to OS9 minimal hasn't helped either. This problem exporting video back to tape is not limited to older machines like mine and yours. Go to 2-pop.com and look at the Final Cut Pro user forums. About 50% of the posts are questions about how to solve dropped frames on import and/or export. Many of these are from people with brand new G4s. So, I don't think that it's necessarily the sonnet card. Maybe the card is making it worse but don't bet the farm on it being the sole cause of your problems.

Since Sonnet admitted there was a problem, I have returned the card. As a replacement I have bought the Acard Raid 66
card, which has hardware Raid 0 stipping, and the array is bootable. ($160) The card will be used with 2 IBM Ultra ATA/66 drives.

Stay tuned, it should be here in a couple of weeks.