Since I'm using JOSM via Parallels Desktop (a virtualisation program for running other another OS on Mac OSX) with Windows XP Professional SP2 installed it told me that it ran out of memory. I confirmed, but a second later another popup was displayed, telling me again that JOSM is out of memory. I guess it's a problem with the virtualisation. I'm running JOSM now with the memory option, and 800M. This works fine for me. I didn't get the error again; I'm saving a lot and that saves me obviously a lot of trouble. So for the log: JOSM now works fine for me. Thanks for all your replies! :)

I'm now using 800MB RAM, as someone has mentioned in the Wiki earlier. It works, though. As I said I'm saving and uploading a lot more frequent.

Hey guys,
I'm now working it all up again, and I'm doing pretty good, in my opinion. As beeing a developer myself I know the issues one is struggeling with. My diary entry wasn't meant to be mean, I was just angry that my work disappeared silently. I'm now saving more often, I'm uploading more often. I think this way I can limit the error counter to zero. You may check out my progress at "Lemsahl, Deutschland" (Germany). I'm doing all the field ways, the forrest and so. Lemsahl has a beautiful nature, and I think this is what matters at OSM, too. As one person in the podcast said: People are adding what's important to them.

Thanks for all your answers, I think with a little more patience and some time one can use JOSM very effective.

That I'll do for sure. Is there no way that someone could get a program working for Mac OSX? I've been using the Mac version, but it didn't allow me to import the Yahoo imagery. I'm now using the Windows version via Parallels Desktop, but as I said it's a pain. I'm going to repeat the steps I took and work on my neightbourhood, but I'm not very fortunate with the program.