Hello, I have been running all of these projects together for some time, recently all projects were renamed to LHC and stopped running,With errors being reported, damaged project files and unable to contine. To fix this I detached from all projects and deleted all the files in the slots folders, leaving the empty folders.This seems to have fixed it and all projects are now running afer reattaching.

1) Close BOINC
2) Make back-up copies of all your XML files to a safe directory
3) Open all account_*.xml files and edit the project name so that it is appropriate to the project URL
4) Open client_state.xml. Scroll through the file. Change your project name(s) that you corrected in the account files to match the URLs here, too. Note that the XML file contains project tags for each project. When you find an affected project, you'll see that there is app and file data that is inconsistent with that project. Delete these entries (including tags) from the file. Don't be shy (you made back-ups, right?) -- you can do it again in case you mess something up. Besides, your editor has undo.
5) Restart BOINC
6) It *might* be necessary to detach an orphan project. In my first attempt, I somehow wound up with an extra LHC@home on one machine. It showed 0 results, so I just detached it. My valid LHC@home entry remains fine.

Feel free to delete the invalid files from your project dirs.