I am currently solving a variety of similar QPs. For some of those QP I run into numerical troubles, when adding upper and lower bounds on the variables, which I can not explain.
Here are two examples, the first working without problems, the second runs into problems. The only difference between the two is the addition of a linear term to the objective function (+ 0.5 * z_146) and the addition of a lower bound (0.5 <= z_146).
Example *.lp and log in comments!
Does anyone have a clue what is going on? SOlving both examples without the 0.5 bounds is possible without problems.
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