I just checked my Results Status webpage.

A] Under Results Status: Error index
---------------------------------------------------------------------------
WU* | Status | CPU-time | claimed/granted | notes
1 | Error | 0.48 | 19.4 / 9.7 | (a)
2 | Error | 0.48 |19.8 / 9.9 | (a)
3 | Error | 0.00** | 0.0 / 0.0 | (b)
4 | Error | 0.00** | 0.0 / 0.0 | (b)

notes:
*CFSW-WU v6.12 under BOINC_v7.0.27
**actually, the WU run for about 150seconds (2.5minutes).
(a) No indication of what the error was. The result log appears like any other log for a valid done-WU.
(b) process exited with code 255 (0xff, -1)

B] Under Results Status: Aborted index
---------------------------------------------------------------------------
WU | WUversion| Status | CPU-time | claimed/granted | notes
1 | 612 | Error | 1.16 | 40.1 / 0.0 | (c)
2 | 612 | Error | 1.16 | 40.1 / 0.0 | (c)
3 | 611 | Error | 0.00 | 0.0 / 0.0 | (d)
4 | 612 | Error | 0.00 | 0.0 / 0.0 | (d)
5 | 612 | Error | 0.00 | 0.0 / 0.0 | (d)
6 | 612 | Error | 0.00 | 0.0 / 0.0 | (d)
7 | 612 | Error | 0.00 | 0.0 / 0.0 | (d)
8 | 612 | Error | 0.00 | 0.0 / 0.0 | (d)

notes:
(c) The result log shows aborted by user
(d) No indication of what the error/situation was. All that shows is ...
<core_client_version>7.0.27</core_client_version>, or
<core_client_version>7.0.28</core_client_version>
... depending on the what BOINC version is installed under the involved machine.

My queries:
1] I recall having effected the abortion of two WUs yet my Results Status: User Aborted index shows blank; the two WUs instead shows under the Results Status: Aborted index. What gives?
2a] Except for the two WUs mentioned in #1 above, I do not recall having effected the abortion of any other WUs. So why is there an extra six WUs under the Results Status: Aborted index? What process/machine did those extra six WU abortions? (My Results Status: Server Aborted index also shows blank).
2b] The word Aborted is a rather 'loaded' word. I suggest using the alternative word Cancel. Thus: Cancelled, User-Cancelled, and Server-Cancelled.
3] Why is there no indication in the results log of what the error/situation may have been in crunching the involved WU? Could something be done so that crunchers can clearly distinguish a result log where the involved WU may have had encountered some possible issue(s) (to the extent that it was initially deemed as an error case) compared to the result log of an initially deemed clean/valid doneWU?
;
; edit1_2012.08.29We.2243.utc:
; -- inserted missing detail:
; "(My Results Status: Server Aborted index also shows blank)."
; edit2_2012.08.29We.2306.utc:
; -- re-touched tables
;