Contribute 3.11 is not a universal binary and it does not
claim to support Intel Macs.
It runs using rosetta when ran on an intel mac. Not sure if
there are any incompatible issues.
You may want to stay tuned for next release where it is
Universal Binary compliant.
Is this problem specific to a page or is it happening for
all the pages.
I have solved the problem thanks to Adobe's tech support.
I had to delete the folders as follows.
user/library/application support/macromedia/contribute2 (mine
was an upgrade and this had to be deleted too for it to work)