ok, the output of your suggestion is:
Intercept 0.0
age -7.82669381218681
ages -7.82669381218681
hours -7.82669381218681
educ -7.82669381218681
y -15638.093540616184
all the same.
But more: now not even the copy-paste of the code in here works (I got the error about the bad initial energy).
I tried to delete the Theano cache, but nothing changes.
Is there any kind of cache of PyMC that I can flush?