The Proactor_Test fails (often by timing out) on Solaris, as well as Linux 
(though it sometimes succeeds on Linux).

From reading the logs, it appears that some aio read operations do not 
complete, although "netstat" shows no data queued on the sockets, and the read 
side is in CLOSE_WAIT state, indicating that the data has been read. But this 
isn't totally clear either.

There is a chance that this is an OS issue, but it would be very unwise to 
rush to such a judgement. I have a small, non-ACE, test program that does not 
fail in this way. Thus, my view at this point is that the issue(s) are most 
probably in ACE.