here is the input for theta executable:

  4
  2
  1 2
  3 4

(also attached)
save it to a file named, say, 2k2, fire up "sage -sh"
and run 

theta 2k2

I get 

$ theta 2k2 
Graph is of size 4 2 
C block 1, blocksize, 4
Checking constraint 1 
Checking constraint 2 
Checking constraint 3 
Iter:  0 Ap: 0.00e+00 Pobj:  1.0666667e+02 Ad: 0.00e+00 Dobj: 
 0.0000000e+00 
[... edited]
Iter: 15 Ap: 1.00e+00 Pobj:  2.0000000e+00 Ad: 9.00e-01 Dobj: 
 2.0000000e+00 
Success: SDP solved
Primal objective value: 2.0000000e+00 
Dual objective value: 2.0000000e+00 
Relative primal infeasibility: 1.11e-16 
Relative dual infeasibility: 2.12e-10 
Real Relative Gap: 8.56e-10 
XZ Relative Gap: 9.63e-10 
DIMACS error measures: 1.11e-16 0.00e+00 5.30e-10 0.00e+00 8.56e-10 9.63e-10
The Lovasz Theta Number is 2.0000000e+00 

Does this work for you?

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Attachment: 2k2
Description: Binary data

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