Noticed if I open with FM10A this is not an issue, therefore is an issue running FM11A with FMS10 server hosted DB. Interesting.
I cannot reproduce this on my Windows system.
WIndows XP, SP3
Filemaker 11 adv
(And it is a system that pre-dates filemaker 11 and has gone through many conversions to it's current version).
Maybe it's mac only, maybe there's another cause.
Do you have other files or copies of this file you can check?
Any custom menu on your current layout? (THere's a bug in FMP 11 that can affect controls in the relationship graph if you have a custom menu.) If so, switch to layout mode before opening Manage | Database and see if you can now get it to work.
Yes, that is it. It was the custom menu set on that layout. Going to layout mode first, then manage database resolved the problem. Thanks, now I know.
For more on the subject. See this thread:
Now to add this to the Known Bug List...