We found this happens in RedSDK mode only, so you can avoid the crash and clean the drawing from bad entities:
- Start TurboCAD, change native draw engine to GDI (Options->Native Draw)
- Then open your file and perform selection of all text entities (Edit->Select By->Entity Type and select Text in the list). Ok. Several text entities will be selected.
- Then you can check every selected entity's Font Size property, and delete all texts where Font Size is 1.#qnan (or similar) value by clicking right mouse button in each Selection Info line and selecting "Delete" in popup menu.
- Then resave file and it will work again.
However we would like to know the way to reproduce the issue to fix it, so if you get same crash again (we think this could be related with text entities transformations, scaling, multiplying sizes on zero or something), please, inform us here for we can reproduce it and fix the cause.