[Symphony] Problem with presolver

[Jiri Spitz]

Hi,

There seems to be some problem in the presolver. It rejects my problem 
with the following message.

Starting Preprocessing...
Preprocessing detected unbounded problem...while improving bounds on
variable C9740 [9740]

However, when I set "prep_level 0" in the option file then the problem 
is solved. Other solvers (CBC, GLPSOL) solve my problem as well.

Jiri
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