While using O.dt=0.5*utils.PWaveTimeStep() instead of GSTS I get

1681  FATAL yade.ThreadRunner /home/me/YADE/yade/core/ThreadRunner.cpp:31 run: 
Exception occured:                                                              
                                                  
Body #0 has velocity==NaN!                                                      
                                                                                
                                                 
1719  ERROR yade.qt4   py/wrapper/yadeWrapper.cpp:368 wait: Simulation error 
encountered.                                                                    
                                                    
Traceback (most recent call last):                                              
                                                                                
                                                 
  File "/home/me/YADE/YADE2970/bin/yade-bzr2970", line 183, in runScript        
                                                                                
                                                 
    execfile(script,globals())                                                  
                                                                                
                                                 
  File "macropore_neverErase.py", line 114, in <module>                         
                                                                                
                                                 
    O.run(1000,True)                                                            
                                                                                
                                                 
RuntimeError: std::exception 

I think it should work for both time step estimations, so I will try to
solve it like Bruno said: "Hertz Ip2 should at least assign kn=ks=0 in
that case."

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https://bugs.launchpad.net/bugs/897237

Title:
  bug in neverErase?!

Status in Yet Another Dynamic Engine:
  New

Bug description:
  If I set neverErase=True Yade crashes with following output:

  O.run(3000,True)                                                              
                                                                                
                                               
  RuntimeError: std::exception 

  and also:

  Traceback (most recent call last):                                            
                                                                                
                                                   
    File "/home/me/YADE/YADE2970/lib/yade-bzr2970/py/yade/qt/__init__.py", line 
192, in refreshEvent                                                            
                                           15:01:13
      self.refreshValues()                                                      
                                                                                
                                           15:01:30
    File "/home/me/YADE/YADE2970/lib/yade-bzr2970/py/yade/qt/__init__.py", line 
265, in refreshValues                                                           
                                           15:01:34
      s=int(t); ms=int(t*1000)%1000; us=int(t*1000000)%1000; 
ns=int(t*1000000000)%1000                                                       
                                                                      
  ValueError: cannot convert float NaN to integer  

  
  You can reproduce the bug with the attached script (similar to the one i 
submitted with version 2960).
  First try to set Law2_ScGeom_MindlinPhys_Mindlin(neverErase=False), this will 
work.
  Then set neverErase=True and yade crashes.

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