Do you have the latest rev? and where are you saving the file to? Try to save it to your desktop then reopen the file.

I have LCam 2.02 and Mach3, 065.
Here's what I did this time:
I opened an Autocad generated .dxf in Laxycam, it opens fine, I make my changes, clean, optomize etc and I saved the file to my desktop. before closing I Post code to Mach3 and it goes to Mach3, everything woirks fine.
The problem is when I close that Lcam file and open it up again without quiting Lazycam, or even if I quit and start over, it appears to open fine in Lazycam, all the info in there just like I saved it, but when I try and post it to Mach3, it says "File could not be opened.

Should be fixed in the new rev... it is on the web now

Thanks
Brian