Not a direct answer to your questione, but have you try'd a virtual printer like CutePDF or similar free versjon, and then "print" to pdf instead of save as pdf.
I used that one before i start to use TurboPDF and it works like a charm.
PS, if you put your version of TurboCAD in your signature in here, it is more easy to get correct help.
V18, V19, V20, V21, 2015 Pro. Platinum
Deluxe V20, V21, 2015
Windows 10 Home Premium 64 bit, 32 GB
NVIDIA Geforce GTX 780m, 1 GB