I tested your file and have no problem in LigthWork or RedSDK renders or anything at all, so the problem is at your end someplace i believe, but i dont have Pro, so used Pro Platinum.
When TC is closed, go to the folder where you save the drawing and see if there is .dwl files in there, if there is, delete them as they can make a lot of "fun", they are protectionfiles, but can be left over if you crash TC.
They will be named like "somename.tcw.dwl"
Repair; Run the installfile for TC again, and at some point you will get the choice of Un install/ Change or Repair, select Repair.
If that not help, then it's time for the Built-in.
The normal place for it is ;
C:\Users\Your username\AppData\Roaming\IMSIDesign\TurboCAD\20\Professional\Data\Profiles\Built-In
You can just rename the folder or delete it
Appdata is normally a Hidden folder, but by typing %appdata% in the Windows/ Run field it will bring you directly to he Roaming, and then you click from there.
When you do this you take away all your special setting's and TC will open like by Default and you will need to reload your cfg if you have made one ( if so, remember to save it first ) and set up your Templates, run the wisiard if needed and so on
Torfinn
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V18, V19, V20, V21, 2015/ 16/ 17/ 18 Pro. Platinum
Deluxe V20, V21, 2015/ 16/ 17
RedSDK enabled
Windows 10 Home Premium 64 bit, 32 GB
NVIDIA Geforce GTX 780m, 1 GB