On 7 Mar 2010, at 01:18, Sam Moffatt wrote:

> It happens. I've been lately having weird issues with my MBP where
> apps will refuse to launch but existing apps work perfectly fine.
> In both cases it occurred whilst I was
> connect to my University network but I fear this is a coincidence.

FWIW problems with networks can often cause a number of delays. For example, 
looking up DNS entries may timeout causing delays.

Secondly, if the University is Mac-aware then they may be providing a 
/Network/Applications or /Network/Library share that gets automatically mounted 
by your client. If that's the case, and the program look sfor options on the 
/Network domain as well as the local one (e.g. ~/Library/Preferences/foo.plist, 
/Network/Library/Preferences/foo.plist, /System/Library/Preferences/foo.plist) 
then this can introduce network dependencies on an app that would otherwise not 
need it.

Lastly, I've had problems where I've put in an explicit DNS resolver (like 
Google's 8.8.8.8) and using DHCP to give me an IP address. If DHCP gives you a 
DNS entry too, and Google's one is uncontactable, then you can again get 
problems. (I also seem to recall that with 10.5, supplying an additional DNS 
server appended to the DHCP provided one; but for 10.6, the setting appears to 
replace any DHCP supplied one.

Alex

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