Any other question that is not specific to an aspect of development or tool can be posted in the General chat forum.
By following these guidelines we make sure that the forums remain easy to read for everybody and also that the right people can find your post to answer it.

First of I exported in .DAE but the event log says it has no error (and thus no error number), it just comes up with a .net outofmemory error when mass material editing to get the materials to convert to po2 and dds. Once that error pops-up I can click, close and continue (JIT-error) and when I then export it gives a 0 bytes .mdl file.

I'm not quite sure what the "po2" file format is; possibly you were referring to *.PNG format (for use with Sketchup as an alternative to *.JPG) ?
IIUC, the phrase "mass material editing" tells us that you are using MCX version 1.3 ?
BTW: It's quite common for the first run through this process to be somewhat challenging !
GaryGB

Maybe I'm way off, but I'll ask it anyway
Did you try to minimize the drawcalls? It helped me once when I had a lot of different textures applied to the model.
Since I have no experience with the combined textures I don't know if it will work.

Next to the "mass texture editor" icon is an icon which is named "minimize drawcalls"
This will combine some of the textures.
EDIT:
I attached a print screen of the minimize drawcall screen, just in case.
I selected all of the boxes and started to minimize the drawcalls. After that's been done, convert the textures to DDS.

You may wish to try working with the "Latest Development Release" of MCX:
http://www.scenerydesign.org/development-releases/
http://www.scenerydesign.org/latest-release/modelconverterx_latest_development_release.zip
Hope this helps !
GaryGB
However I did find another clue perhaps. Two textures seem to cause the trouble. Both of them are 1X1 pixels big and are just gray. I can't remember using it anywhere in my sketchup model, though they where transfered into the textures folder when exporting to .dae .



