I know this has been reported in a different thread but I can't find it and I think that since it is a fix, I'd mention ot here anyway.
Some version of the N70 have a big where selecting 'Edit' from the gallery on an image results in a crash or a White Screen of Death.
This has fixed that problem on my N70;
Copy ImageEditor from Z:\System\Apps to E:\System\Apps
That's it! I guess you could put it in C: if you wanted, but I got a 1Gb card so can't be bothered to use up my internal memory. This solution not perfect (some menu options are off the screen), but at least it does work.
If your video editor doesn't work, there's no need to copy anything, just run it once from Z:\System\Apps\ManualVideoEditor.
UPDATE: Once you're run the application, you can delete the copy on the E: drive and all will still work fine (I still reckon it's an .INI file issue).
UPDATE 2: The extra menu options are caused by having two copies of the application (Memory card and ROM). Just delete the copy on the memory card and you're sorted.