We sincerely apologise for the inconvenience caused to site administrators who had already upgraded to the previous release. Releasing a security fix version where MNet importing was broken was unacceptable, and we will endeavour to avoid a repeat in the future.
We would also like to remind site administrators that Mahara 1.3 is no longer supported and that the Mahara project currently only offers security support for the Mahara 1.4 and 1.5 series. The support for Mahara 1.4 will end shortly with the release of Mahara 1.6.
As usual, if you find any other problems with these releases, please file a bug on our tracker: