What version of Matrix and Edit+ do you have? Matrix version can be seen when you log into /_admin mode, with the latest Matrix 5 version you should see it bottom left (small grey text) and also in the title of the page, which will appear in the tab for the web browser. Edit+ version can be seen when you log into /_edit mode, bottom left of any of the editing screens.
Hi James, these bugs might be hard to replicate without exact steps. Seeing as 5.0.2 is quite old now and several improvements have gone in since then, this might already have been fixed.
If these issues are causing big issues, I suggest you send in a support ticket into Squiz so that it can be looked at more properly and resolved for you guys.