This is a weird one. I make changes to an existing activity, save the changes. Test the changes via the QA Link but my changes aren't present. If I edit the activity I can see my changes there in the scripts.
When I edit the activity on a different computer but with the same account, the changes I made earlier aren't there. However, saving it on this computer gives me the same results.
The only way I've found to effectively save changes, is by copying the activity and saving it.
EDIT: Tried the copy activity method, and it doesn't work either. Instead of showing the previous changes, it shows up as if it's a blank activity. I can still edit and see my changes. Also tried deleting the scripts and re-adding them.