page content not updating

[beeswax]

v0.13. I've created a basic site with a home page and some latin mumbo jumbo text. when I go to change the content, i can see it in preview but after hittting Submit or Apply and going to View Site all I see is the old latin text etc. I've deleted the Home page entry and started again, but no luck. it's as if I've got one chance to make a change and that's it. any ideas? I've just checked and this seems to be a site wide occurence.
thanks

update: I may have cracked the problem. I was having trouble with a previous install of CMSMS so I deleted it from my server, but not the database. uploaded and installed a new copy using the old database. this brings up a new question tho' - is there any way of saving the changes I've made to the old site and applying them to the new site?
thanks