I poked around a bit and found that the command JCLover ran is the same as the one suggested by
The X Lab.
(I also found
Error -10810 Openng Applictions or Relaunching Finder.)
Edit: From the second linked doc:
Some advocate resetting Launch Services as a solution, but -10810 issues are generally not a problem with the Launch Services database: the problem is usually due to a filled processs table.