Just to clarify, is it 1.7.6 Windows client?
So first thing I’d ask is, did you make this change in registry (browser emulation) Enabling HTML5 in the Windows .net Player
Now, if no, could you please try and see if it will improve the layout playback?
If yes, I think I’d need to see this layout, so if you could export it and upload it to dropbox/similar and share the download link with me (here or via pm).