I have searched the forums and not found anything else specifically referencing my issue (which is not to say it is not there, just that I could not find it).
The scenarios is that I load a fairly large solution in Visual Studio 2010 with ReSharper 6.1 (although I believe it also happened in 6.0 as well). This solution contains four solution-level folders, with 1 Silverlight application, 1 ASP.NET 4.0 (WebForms) application, and 8 library projects of various types. Everything (I am pretty sure) is written in C#. When I first load this solution and start working, everything is pretty much fine. However, after maybe 15-30 minutes of working, the bulb menus no longer appear. The code is still highlighted where R# is suggesting improvements, and hovering over those highlights will show a tooltip explaining the issue (usually, sometimes it takes a bit to catch up and sometimes it just never tells me what the issue is), but the bulb menu is nowhere to be seen. I checked the settings (ReSharper/Options... Code Inspection/Settings), and the "Show analysis options items in bulb menu" option is still checked, but the bulb menus don't appear. Similarly, unchecking and saving this option, then opening the Options dialog and re-enabling it does not bring it back.
Has anyone else seen this issue? Is there a workaround other than exiting Visual Studio and restarting? Is it something I should report as a bug?
From my ReSharper/Help/About dialog:
JetBrains ReSharper 6.1 C# Edition
Build 22.214.171.124 on 2011-12-21T05:15:24
Visual Studio 10.0.40219.1.