There must be some difference, either in your Opus config or your mouse config, between the two accounts.
Edit: Or, potentially, the other programs you run under the two accounts. Do you use any macro/gesture/hotkey programs, for example?
[quote="nudel"]There must be some difference, either in your Opus config or your mouse config, between the two accounts.
Edit: Or, potentially, the other programs you run under the two accounts. Do you use any macro/gesture/hotkey programs, for example?[/quote]
I dont think to be honest it is an Opus config setting, as described earlier, if I disable the locally installed opus and run from a USB key on this machine I have the same problem, yet the same USB key config works ok from another machine. It is definitly some thing in the user registry, I have tried swapping ntuser.dat and the problem goes away, unfortunatly this also disables some important software I need for work (VPN and EDI for instance). The problem also exists in safe mode . I am not aware of any macro/gesture/hotkey programs that are running. But surly if there was, list mode etc, would suffer from the same problem?
I have tried deleting all mouse and touch pad drivers (did I say it was a lap top?) with no joy.
I have started swapping out different parts of the user registry to try and find the area in which the problem lies, but this is taking a lot of time and so far I have not found the guilty keys.
Sounds like a lengthy process. 
The only thing I can think of is to use a tool like Spy++ to monitor the mouse messages that get sent to the Opus window, but I don't know if there's a free version of Spy++ (or an equivalent program) so if you don't have Visual Studio it might not be an option.
Sorry I can't think of anything better to try to help track it down.
[quote="nudel"]Sounds like a lengthy process.
The only thing I can think of is to use a tool like Spy++ to monitor the mouse messages that get sent to the Opus window, but I don't know if there's a free version of Spy++ (or an equivalent program) so if you don't have Visual Studio it might not be an option.
Sorry I can't think of anything better to try to help track it down.[/quote]
Thanks, I really do appreciate your input, and when or if I get to the bottom of the problem I will post it here. Thanks again.
edit:
Just downloaded wininspector and the only difference I can see in the lister types are Detail & Powermode Class is Dopus.FileDisplay while all the others use Class Dopus.IconFileDisplay. Dont know if this is how it should be. I'm stepping in to unknown territory here.
Hi Nudel, thanks for the suggestion on using Spy... I think, I've narrowed the problem down enough for you guys to get to more details in the code... I noticed (by using only a WM_LBUTTONDOWN + PARENTNOTIFY filter in SPY) that no PARENT NOTIFYS were occurring so I just guessed that maybe it had something to do with the mouse click speed and sure enough slowing the click speed down below the 8th "notch" in the mouse settings dialog allowed me to initiate an inline rename and SPY also corobberated this by logging PARENT NOTIFY msgs. This may, of course, vary by mouse driver but I think this hopfully gets us (well you) in the ballpark. 
Great work Brian, worked for me as well. My click speed was only fractionally over the threshold, but lowering it slightly has fixed the problem. So thanks Nudel for suggesting SPY, and a big thank you to BrianFSmith for then finding the problem.