To delete a invalid thread in a lounge follow the instructions below :)
- Hover your mouse over the topic you wish to delete
- at the bottom of the window will be the url with a tid=4 digit number
- Make a note of the tid number
- reply to another topic
- after you click reply on another topic, in the address bar delete the tid number and replace it with the one you made a note of
- press enter or go
- add a reply and click save
You should now be able to delete the thread.