Hi,
Sorry to hear that! This sounds like it’s due to some changes in the CSS in the latest release of the bundled Flexslider component. These were discovered after the initial 3.6.0 release and are now fixed. (Please let us know in the support forum if you still have a problem).
If you have 50-60 paying clients I’d certainly recommend testing updates before pushing them to live sites, and deploying a backup plugin so that you can do instant roll-back if you find a problem. We do do as extensive testing as we know how, but there are always some usage combinations that aren’t covered; that’s the nature of software development with a plugin with 800,000 active users, unfortunately. Sometimes if you see a .0 release and if you don’t have any test sites then it can be best, realistically, to wait 24-48 hours to see if it’s swiftly followed by a .1 (etc.) release (as in this case). Again, sorry for the bad experience and I hope you will keep trying MetaSlider out as we keep working to improve it!
Best wishes,
David