How big is your bowl and are you using some kind of heating core or flower nail in the center?
I just finished doing this yesterday - on my 3rd try - I wrapped my baking strips around the whole thing with pins holding it in place - and it worked fine. I had to trin the top off about 3/4 of and inch - but it was fine inside!
Just about to post the doll akes I made with it. It was an 8 cup pyrex glass measuring bowl.
Good luck!
Fatandhappy,
Did you put the baking strips only on the top part of the bowl, or around the whole bowl? You didn't use a core?
Thanks,
Nicole 
I agree with Hockeygirl658. You need some heat conductor in the center. Whatever you use make sure you grease and flour or spray it with non stick spray. I have even used aluminum foil, folded and rolled tightly, a small, empty, clean food can with both ends removed.
to maintain even baking(i find it more difficult to achieve with the glass dishes), try wrapping the outside of the bowl with bake even strips, or brown paper bag strips that have been soaked in water. Reduce temp on oven to no more than 325 f.
All4cake- Oh I am so glad you made it over here before I did! I finally fell asleep last night around 4 am and forgot that I had posted here.
That is exactly what I was thinking! 
Have to have a heating core of some kind. Reduce the temp on a bowl that big and use something to get better heat conduction around that glass bowl. (I used dish towels, SOAKED in water and pinned together the last time I did a bowl that big)
Jarnli- Let us know if that helps!
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