I've got this same kind of problem, terrain looks really blocky (ddc black, tb green squares, etc)...where would i find the manual downloads available to fix this? I've had to do manual updates on occasion, but would i just download the last patch, or all since ch 5 release?
Repatching won't work. The issue stems from older clients being patched into chapter 5. You'll have to uninstall the game and reinstall using the new chapter 5 client. I had the same problem so I reinstalled using the box copy which is a chapter 3 client, and that didn't fix it. So I reinstalled again using the chapter 5 one and it resolved my problems.
Before reinstalling, make sure u back up ur screenshots, addons, and ur character saved folder.
C./program files(86)/runes of magic/screenshots
C./program files(86)/runes of magic/interface/AddOns
My documents/runes of magic
The bottom one wont show unless u have "hidden files and folders" enabled.
Hope this helps