I had a problem which may be related.
Eclipse started showing folder names as a concatenation of the folder name with other elements. A folder named "x" was being replaced with "xorg.eclipse.jdt.core.javabuilderorg.eclipse.m2e.core.maven2builder"
After exploring various possible explanations and/or solutions, I realized this behavior appeared after my having deleted a project folder without checking the box "Delete project contents on disk (cannot be redone)". When I subsequently re-checked out the code from an SVN repository, a folder named "x" was still on my disk, and so I suspect Eclipse created a longer version of a folder to contain "x" using other elements from the buildSpec.
I fixed the problem by closing Eclipse, deleting both folders ("x" and "xorg.eclipse..."), reopening Eclipse and checking out the project again.