Thanks for the response. I tried deleting the preference file, but to no avail.
When I look at Console on trying to open Opera I get either (this one launched from Butler):
22/10/2009 10:05:26 /Applications/Butler.app/Contents/MacOS/Butler[146] spawn_via_launchd() failed, errno=12 label=[0x0-0x135135].com.operasoftware.Opera path=/Applications/Opera.app/Contents/MacOS/Opera flags=1
22/10/2009 10:05:26 com.apple.launchd.peruser.501[108] ([0x0-0x135135].com.operasoftware.Opera) fork() failed, will try again in one second: Resource temporarily unavailable
22/10/2009 10:05:26 com.apple.launchd.peruser.501[108] ([0x0-0x135135].com.operasoftware.Opera) Bug: launchd_core_logic.c:8719 (23932):35
or:
22/10/2009 10:15:53 com.apple.launchd.peruser.501[103] ([0x0-0x1c01c].com.operasoftware.Opera[175]) Exited: Killed
22/10/2009 10:16:45 ReportCrash[901] Saved crash report for Opera[899] version 10.10 (6674) to /Users/Piero/Library/Logs/DiagnosticReports/Opera_2009-10-22-101645_pieros-computer.crash
22/10/2009 10:17:18 Problem Reporter[902] Internal error getting system profile: NSInternalInconsistencyException couldn't fork: errno 35
22/10/2009 10:17:46 Problem Reporter[902] Timed out trying to get system profile information
22/10/2009 10:18:10 /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder[113] NetworkBrowser failed to launch "/usr/bin/nmblookup" (Resource temporarily unavailable)
or:
22/10/2009 10:25:26 com.apple.launchd.peruser.501[103] ([0x0-0x111111].com.operasoftware.Opera[911]) Bug: launchd_core_logic.c:3232 (23932):0
22/10/2009 10:25:26 com.apple.launchd.peruser.501[103] ([0x0-0x111111].com.operasoftware.Opera[911]) Exited: Killed
or just simply:
22/10/2009 10:26:29 com.apple.launchd.peruser.501[103] ([0x0-0x117117].com.operasoftware.Opera[928]) Job appears to have crashed: Bus error
It doesn't mean much to me. Sometimes, after trying to open Opera, the system just seems to die and I get error messages if I try to open any application! It's quite alarming and requires a restart. - EDIT: have subsequently found this was probably due to bash fork resource temporarily unavailable, which does stop after a few minutes. Still no Opera, though 🙁