Presumably you are still using the old RTF-Import/Export driver from DMC (RTF.CXT). This RTF driver was unfortunately programmed rather badly and keeps crashing continuously – unfortunately this is hard to reproduce.
Therefore we developed a completely new RTF-Import driver (RTF_I.CIT) some time ago. You will find it on the invers-disk #30. This new RTF-Importer is much easier to use and naturally does not throw any bombs – there is even a demo-version that scrambles all vowels but otherwise behaves just like the full version.
If required, please decide on an upgrade to the invers-RTF-Import.