Hi Coochas,
When mine got stuck a couple of years ago, I managed to get my hand under the bottom bow (from the foreword side) and push it up from underneath, then when it met the middle bow, the whole roof came up as normal.
It helps if there are two of you, one each side, and to push gently.
I subsequently fitted two webbing straps to the bottom bow, so I can now pull it up to meet the middle one if it ever decides to be difficult again - thankfully it has since behaved itself.
Good luck
Paul