Well we have finally upgraded to Mahara 1.4. We waited this long as we were hoping for a Mahara 1.4.1 release but because 1.4 was so long coming we guessed most of the bugs were pretty well sorted. My first 5 minutes tells me we have been pretty successful, but there are a few bugs. My favourite browser Chrome seems to have issues saving edited pages (new name for a view). Firefox is better. Also I have noticed you can't change the number of colomns - it encounters and error message. There are a few error message s on some of the group tabs as well (shared pages and topics).
Please be patient for a few days as we work to resolve these issues. In the mean time I suggest you use Firefox (or perhaps IE if you must).