I'd tried to implement a random number generator as described on http://www.mail-archive.com/openmodelic … 00563.html or in http://www.robotic.de/fileadmin/control … -01-21.pdf (page 97).

The model runs OK in Dymola (trial version), but fails in OpenModelica with "Internal error, check of model failed with no error message" message. Some other models using sampled inputs and pre() operator also behave differently in Dymola and in OpenModelica.

Are there some known problems with discrete simulation in OpenModelica?