Triangulation halted

Question

Good morning Community, 
 sometimes we've got problems with triangulation in InRoads in our company, it throws the message "Triangulation halted. ..." and I know that it's a known issue descriped in http://communities.bentley.com/products/road___site_design/w/road_and_site_design__wiki/triangulation-halted.aspx . But unfortunately we're not able to solve the issue as it's descriped in the article. The problem occurs irregular and there seems to be no visible problem with our geometries in the DesignFile. 
 Some testdata you'll find attached. I uploaded a DesignFile which is the source of the DTM I attached as well. Furthermore I added some screenshots of my DTM import options and the error message itself (for both configurations listed below). 
 What I tried so far is altering tolerances in InRoads Project Options, copying a part of the DTM that's corrupted into a new surface, importing the geometries in different ways (selection, by level or fence), using the extended data check option for triangulation and using the Resolve Crossing Segments feature. But all in all it was not successful, the error still occurs. 
 In my current version of InRoads the error message points to the location where the issue occurs, but in later versions it just says "No point found" and that's it - without any hints - that's really unsatisfying. 
 I tried to test in the following two setups: 
 Configuration 1: Intel Xeon CPU 5160 Microsoft Windows XP SP3 Microstation SS2 08.11.07.443, InRoads 08.08.00.46, Regional setting: Germany (but with . as decimal separator) all files are stored locally 
 Configuration 2: Intel Core i7 3770 Microsoft Windows 7 SP1 Microstation SS3 08.11.09.357 InRoads SS2 08.11.07.566 Regional setting: Germany (but with . as decimal separator) all files are stored locally I hope someone may provide a solution for that issue, since we need the DTM in our business process. 
 Thank you in advance, 
 Maik Schulze