EOS1 with 2nd water. Some issues ...

Hello everybody,

I'm quite new to Tough2, and trying to build my 1st case. So far I managed to run a very simple case with 2 wells (1 producer / 1 injector) in a water filled reservoir. My objective is to model a tracer test. For this I'd like to use a 2nd water to be injected and be able to track it. 

But as soon as I switch the TYPE control in GENER from COM1 to COM2, I don't manage to run my case. The run goes fine until I reach the timestep where injection is supposed to start, and then unexpectedely stops. 

Also the run take significantly more time. SO I'm guessing it experiences convergences issues when injection of the 2nd component starts. 

Does any of you have any clue what is happening ? Thanks a lot for your help !

Florian