X1.3 Exporting Plans: Warning????

[Zowie]

I'm getting this warning quite a bit in X1.3 when I export: "Cannot find or open the file to save your plan. If saving to removable disk, make sure the disk is ready"

I'm saving to the C: Drive. I've never had this problem with V10, 9, 8.

I export a lot and this is a bummer. Anyone know why this might be happening?

All files and images associated with this layout are intact and saved with the plan in the same file.

Thanks much, Barry