>>>Couple of things to check that may or may not help:
>>>
>>>In Solution Properties :
>>>In "Debug Source Files" check which locations are (and are not) searched for source files
>>>
>>>In Tools/Options/Debugging:
>>>in 'General' make sure 'Enable just my code' is *not* checked. Also try with 'Require source files to exactly match.... ' unchecked.
>>>Check settings in 'Symbols'
>>
>>Thanks Viv,
>>
>>that got me going again. I removed a few paths from the "not searched" locations, then when I was prompted to locate the source code from an MM.Net class I searched for that class and found it and everything seems OK now.
>>
>>Hopefully now I'll be able to work out what's wrong with my code :)
>
>AFAIR, if VS is searching for source files and having difficulty finding them in the expected location then if you hit 'cancel' it automatically adds that location to the 'do not search here' list. Maybe that's what happened in your case ?
>
>Anyway - as long as your good to go.......

Yes, that is what happened. Why it started prompting for the locations in the first place is a mystery though as I used to debug this before without a problem