Resource calendar shows "no information"

[Cmnsol]

First, I'm new at resolving issues on resources. My question...We have 3
conference rooms set up that anyone in the company can use. They have always
worked fine. Today it was reported that one of them shows only "no
information" when scheduling a meeting to that resource. The other 2 still
show busy or free. How can I fix this resource to show it's free and busy
times?
Thank you

 

[bwash70.com]

I also have this issue on about 15 of our 60 odd resource calendars.

Any help would be appreciated.