I donโt know if this has ever been resolved, but I had a similar problem with Aptana Studio 3 based on Eclipse, and I was able to solve it without deleting / reinstalling or transferring everything to a new workspace.
I finally solved it by right-clicking on every available perspective in the upper right corner and closing everything:
,
until all prospects are closed and you see a screen as shown below:
.
At this point, you should re-open the prospect, and for me, at least, it worked. Hope this works for you and others who have this problem.
Greg jennings
source share