When double clicking on the package description in the R package manager, the help system will always crash with a "Error: ignoring SIGPIPE signal".
Also, searching for a help item in the help system will bring up the "help topics matching xxx" window, then double clicking on the "topic" column of any listed package will always crash the help system with " "Error: ignoring SIGPIPE signal".
In addition to these consistent errors (both on R 2.10, and R 2.11 devel), the help system will also randomly crash with "Error: ignoring SIGPIPE signal".
This is a rather big problem, because the ONLY way to restore help is to re-start R, which can be extremely annoying.
Unfortunately the report is too late for today's release - it would have been very useful a few days ago.
Neither of the lists are meant to be used with double-clicks - single click is sufficient (double-click results in two requests of which the first one is cancelled by the subsequent one leading to SIGPIPE).
The underlying problem is that Rhttpd can raise SIGPIPE if the client closed the connection unexpectedly (R.app package manager is just one example how that can be done). The proper fix is to modify SIGPIPE handler so it won't raise an error when the client closes the connection prematurely in Rhttpd and this is now committed in R-devel.