By Chad Upton - senior consultant

I’m not sure what causes it, but I was seeing it a lot for a while.

When it first appeared, I checked google to see if anyone else had the same problem. No luck there. Then I talked to Derek Santos and Alain Thibodeau and they had seen it as well. Here’s what we’ve found takes care of it:

1. Close all open tabs in Flash Builder (middle click on tab or left click on the x on the tab)
2. Close all open projects in Flash Builder (right click on project > close project)
3. Close Flash Builder
4. Open Flash Builder
5. Open any necessary projects
6. Clean All (Project > Clean > Clean All Projects)
7. Build and Run

So far, that’s worked every time. You may also want to disable design view to see if that helps.

UPDATE Nov 29, 2012:
I ran into this problem again this week. None of the above worked this time, so I had to delete the workspace and create it again. That fixed it.