Xhilyn, I had much the same problem when trying to downgrade back to the version in the Jaunty repos. It turned out, when I ran a search for "openoffice.org" in synaptic, that there were several packages still purporting to be version 3.1 packages, and all I had to do was remove those and then everything was back to normal. I can't remember what those packages were, mind, so you'll just have to do some hunting (sorry).
Once I'd removed these rogue packages, everything worked just fine, though I do remember that for some reason I had to install the package openoffice.org-gtk myself, as this was not pulled in by the "openoffice.org" meta-package.
EDIT:
Alright, I had some time, so I went back through the process of upgrading and downgrading again, to replicate the problem, and go through solving that problem again. I typed up what I was doing in gedit, as I did it. This is what I came up with:
upgraded to the OO.o Scribblers' 3.1
some packages were removed due to l10n issues took note of these, you might have a similar set missing for any of your locales- they are (for me): language-support-translations-en language-support-translations-ja openoffice.org-help-en-gb openoffice.org-help-ja openoffice.org-l10n-en-gb openoffice.org-l10n-en-za openoffice.org-l10n-ja openoffice.org-writer2latex thunderbird-locale-en-gb thunderbird-locale-ja
disabled OO.o Scribblers' repo uninstalled OO.o 3.1 by meta packages "openoffice.org" and "openoffice.org-core" tried to reinstall OO.o from jaunty repos (default) using meta package "openoffice.org"
encountered terrible loop of dependancy death!
searched for "openoffice.org" in synaptic
the following packages are still claiming to be version 3.1 openoffice.org-common openoffice.org-style-human openoffice.org-style-tango ure uno-libs3
removed those packages listed above. installing OO.o 3.0 via the "openoffice.org" meta package now works! But... the following packages are not installed:
openoffice.org-gtk openoffice.org-style-tango language-support-translations-en (which also pulls in openoffice.org-help-en-gb, openoffice.org-help-en-us, openoffice.org-l10n-en-gb, openoffice.org-l10n-en-za and thunderbird-locale-en-gb) language-support-translations-ja (which also pulls in openoffice.org-help-ja, openoffice.org-l10n-ja and thunderbird-locale-ja)
so I installed them myself!
And that's the entire process I went through in upgrading, finding it not quite satisfactory, and downgrading again. The difference for you will depend on whatever locales you have installed, and I guess whether or not you have openoffice.org-style-tango installed, but other than that I imagine your experience is the same as mine.