Hi, I'm experiencing many issues with Illustrator at this present time. Whenever I save my file my screen goes black and it makes my PC lag. The sub menus also disappear frequently. Sometimes when I open my file it says that it's "read only" and doesn't let me on (Sometimes it does). In general Illustrator at the moment is very laggy, slow and really unreliable. These are serious bug issues that need to be fixed ASAP! The only way to come around this issue is by copying and pasting all the content into a completely new file - this is very inconvenient. I hope this spreads awareness.