Our Development team has been looking into the RECord Playback Issues that members of the community have been reporting. It appears that the most recent version of FIREFOX is currently not compatible with the file type (.m4a) RECords are encoded into on hitRECord.
We are looking into some upgrades that we hope will make the files compatible with FIREFOX, but in the meantime we recommend using a different browser.
Apologies for the inconvenience - and thank you for everyone's communication! It played a big part in helping identify what the issues have been.