Been meaning to mention this, and I can't remember if it's been brought up already:
When saving a model containing a flexible part, LDCad adds a "0 UNOFFICIAL_PART" line instead of the "0 !LDRAW_ORG" line required by the OMR. It can be changed in the header dialog, but the change will be undone at the next save. I've gotten into the habit of fixing it manually now, but it does require that extra step when OMRizing (and if I end up saving the file in LDCad again, I often forget to re-fix it).
When saving a model containing a flexible part, LDCad adds a "0 UNOFFICIAL_PART" line instead of the "0 !LDRAW_ORG" line required by the OMR. It can be changed in the header dialog, but the change will be undone at the next save. I've gotten into the habit of fixing it manually now, but it does require that extra step when OMRizing (and if I end up saving the file in LDCad again, I often forget to re-fix it).