Please let me clarify several questions with you:
1. Which type of NI-FBUS interface did you use? USB-8486, PCI-FBUS series 2 Card? or something?
2. What kind of crashing did you mean with Communications Manager? A screen shot will be better for checking.
3. A quick way to find out the possible problem relies in it to connect another device, other than Softing one, to the H1 network. And run Configurator to see whether any problem happens.
If you are suspecting the Softing DD file, you could try it with offline interface.
Should you have any questions, please let me know.
Thanks.