[Scip] SCIP doesn't start the solution process after presolving

[Sebastian Ruther]

  Hello,

I am trying to solve a MIP but SCIP or Cplex gets stuck somewhere.
I load the default plug-ins and after presolving it doesn't start the 
main solution process
.
Presolving deletes 1300 variables and 800 constraints. After that the 
problem has 16000 constraints and 19600 variables with 19200 being 
binary and the rest continuous.
After displaying the presolving time (which is 157 sec) nothing happens 
for at least one hour. The CPU is busy but like I said the main solution 
process is not started. What's going on? Is SCIP transferring the 
problem to Cplex? That shouldn't take so long for a medium seized problem.
After 1-4 hours it starts the solution process.

Regards,
Sebastian