(Windows 8.1 x64, SE RC3 x64, fresh config via vs.exe -sc <some temporary folder>)
The auto-generated slickc.vtg (when you first edit a macro file and search for a definition or references) can't be deleted via the button or context menu, since those are greyed out. Selecting file(s) referenced in the file list of tagged files and using the not-greyed-out "Remove file(s)" puts up the "Do you want...(etc.)" dialog, but no deletion is carried out.
So the paths for SE Beta6 were still present when I jumped to definitions/references in RC3--naturally that did not work as expected.
UPDATE: manually deleting slickc.vtg leads to the tag file still mentioned in the Tag Files dialog (and undeletable), but the file list is now empty: searching for definitions/references auto-fills it with the correct macro files paths.
What's wrong here?