When you say build errors, I'm guessing that you mean the error console from the background compile? Or is the output window from the actual build dirty too?
I seem to recall that my spurious errors from the background compile can sometimes be resolved from a clean all.
It doesn't sound like you're running into the project dependency bugs, since they are resolved by restarting the IDE.
Assuming that you know how 'file order matters' and you know about 'the implicit module with same name as filename' (e.g. stuff described in [link:lorgonblog.spaces.live.com]) to rule out 'user error', then this sounds like it could be a known bug in the CTP release, related to #5 here: [link:blogs.msdn.com].
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I was unable to find other posts along this line, but it may be that I couldn't figure out the right search terms. However, I'm new to F# and am writing (with a friend) a moderately complex system (about 6-8 projects in the solution).
I'm working on one of the F# projects and find that during refactoring, I often move types, interfaces, etc. from one file within a project to another. When doing so, it's not unusual for me to get build errors (building either the project or the entire solution) after the refactoring where the errors claim that something is undefined (usually something I've moved).
I can even close the project and reopen it without getting rid of the errors, but if I exit VS completely and restart it, the errors go away and the build is fine. Right now, I can't put my finger on a specific example, but it's happened about a half-dozen times in the last day.
Has anyone else seen behavior similar to this? Any ideas on how to prevent it? Is it something MS needs to address?
Thanks,
--Don