The question really was, "What are you able to do in 2010 that you weren't able to do in 2007?"
In the short term, you're not really missing a whole lot.
Eventually, though, you're going to have to get an upgrade to the CNC software that works in 2010. You really can't avoid this, for the reason that started this thread and others that will surely come up eventually.
When that's done, any incompatibility issues go away and you can use 2010 exclusively.
Yes, the CNC software will need to be upgraded, but RouterCIM always runs 1 year behind Autodesk. So buying the 2009 RouterCim will have the same problems as the 2007, unless they have this problem addressed. Mights as well wait a year.
There are other ways around coping and pasting, but this is the most convieient and I would like to continue this process we have set-up.
I am having a similar issue but came about it a different way.
I am using Civil 3D 2010, created a simple AutoCAD drawing with no special objects, basic lines and text. I had saved it in 2010 format but realized I needed one of my Drafting Techs to work on the drawing and he is on AutoCAD 2009. I performed a save-as overwriting that 2010 file with the 2007 format.
Now he uses Ctrl+C to copy and Ctrl+V to paste. He can copy just fine, but he can not paste in that drawing. He receives *Invalid* when _pasteclip is used.
Copy and Paste works fine for all other drawings that were native 2007 format.
The work around we used was to copy the entire drawing to the clipboard, create a new drawing in AutoCAD 2009, and paste it's contents in that new drawing.
I'm not sure what the root cause for this behavior is.
"I'm not sure what the root cause for this behavior is."
The root cause seems to be that 2010 does not do a (consistently) good job of saving back to earlier versions. There are all sorts of other posts here that have to do with problems opening back-saved drawings in earlier versions. You seem to be fortunate enough to be able to open the drawing(s), but there is apparently something in them still that causes other problems.
I can't wait to see how many issues the first service pack addresses.
call me crazy, but open the file read only while it's still live in 2010?
there would seem to be some very odd reasons for what you're doing, which as best i understand are these:
you work in 2010, however need to have the file open in 2007 to drive your CNC. your standard procedure is to copy and paste from one file to another, instead of (*cough* good practice *cough*) saving the file and opening it in the other.
copy and paste can introduce some goofs even within the same session (i meant paste to original coordinates, but hit something else, etc) where as if you want the SAME data, just open it, or save as.... ore really "SAVE" as a separate file (not qsave, or the save button, or ctrl s, type in "save") and then open that in 07.