I took the plunge and picked up a K20D from Amazon and it came UPS Monday. YAY!
I'm absolutely loving all the added versatility. WOO HOO!
Downloaded first round of pics and previewing them in DigiKam. Wow them are big!
I then attempt to convert the from RAW to JPEG and things go horribly wrong. PEF shots white balance is completely mucked up, and both DNG and PEF end up with a black stripe on the "right hand side" of the resultant JPEG. BOO!
I have tried LightZone, UFRaw, RawTherapee, RawStudio and F-Stop. All produce the same results. Checked to make sure I had the latest versions of all the above as well. However ... I did conversions of both DNG and PEF from the K20D using purely CLI tools: dcraw & NetPbm (pnmtojpeg) and the JPEG outputted is fullly intact. I even used the version of dcraw (8.77) packaged with LightZone 3.5 in the CLI and got good results.
So... I don't believe it is an issue with dcraw but I have zero clue what is the next place to look. I googled around a bit and haven't come up with any fixes that actually work. The only K20D fix I have seen thus far is for firmware 1.01 to change the "Make" exif data to "PENTAX Corporation" rather than merely "PENTAX" - but I am still on v1.00 of the firmware so that isn't even an issue. K10D DNG/PEF files convert just fine and dandy and I've got about 5K images to prove that.

Any gurus (or just lucky individuals) that have found a solution?
FYI I'm using openSuSE 10.3 32-bit on a 2yo AMD 3800 machine w/ 4GB of RAM.