I hope I'm not putting this in the wrong place; I don't where else to post it. I'm not sure if it's MyEclipse or the Matisse plugin, but after making ANY change, it switches from from the design view to the source view, it's driving me crazy. I didn't happen until my daughter (infant) pressed a random key combo. It's MyEclipse Blue 10, and I doubt it helps, but my OS is Windows 7 64 bit
I'm not sure what key combination could cause that but I suggest you try switching to a new workspace, import your project from the old workspace into the new one and see if that solves it. Or it might be something to do with this issue reported a couple of years ago. Otherwise, post on the Myeclipse forums for (hopefully) better support.