A recent upgrade of a CF7 to CF8 sent my blood temperature past the 100C redline when the editor of a content management system went belly up. The bug is a curious one: CF8 now has some new functions (filedelete, filecopy, filewrite, etc) which are in conflict with functions in the KTML for CF version.
This is a little annoying considering that Adobe has acquired Interakt, the maker of KTML. Only God knows thousands of KTML installation that has gone crazy.
Now, not all versions of KTML have the source code so those hapless victims are in for it. For me, all I did was look for the functions and where they were called and changed the function names.