We ended up going to the Google Chrome website and downloading it to the macbook air. This has worked for now.
PLButchers... While I could be wrong, I've got a feeling the issue is related to the multiple third-party sites and trackers working through the MYOB site. To name a few: fullstory(dot)com, sumologic(dot)com, segment(dot)com, wistia(dot).net, ctfassests(dot)net, segment(dot)com... this list goes on and it seems hugely excessive. I looked into the function of fullstory(dot)com and it appears to keeps a video recording of the behaviour and interactions made by each person within the site, which to me sounds unethical and an invasion of privacy. I've checked the third party requests from other sites and the MYOB site has the most requests associated with it so I wouldn't be surprised if it's causing the issue. It may be that the browser is trying the block and mitigate some of these third party requests which causes it not to load.
While I'm definitely not a techie - it just seems odd that it was working on Thursday morning and not working on Thursday afternoon - it was literally less than an hour between full access and nothing...with no updates done in that time - I've set it so they happen overnight so I'm not working on / in the middle of something.
