I have seen a similar problem on the F88 (big brother
of the 87. same data sheet, anyway) and an MELABs
programmer.  I've been given advice to ground the LVP
pin (and turn off LVP in the config word) but haven't
had a chance to try that though I never enabled LVP. 
I always thought it was an MELABs programmer problem
but maybe not.

Its a real pain because the F88 is a pretty nice chip.

Phil

Dave Turner <dave.w.turner@gmail.com> wrote:
> Hi all,
> 
> Noticed this a while ago, whilst working on my timer
> things.  It has
> now become a serious problem (well, very annoying at
> least).  Every
> time I run my program on my chip, I find I need to
> remove power from
> it for a second, or the MPLAB ICD2 refuses to
> program, in either
> programmer or debugger mode - it either says the
> device ID is 0, or it
> failed to verify.  After unplugging the power supply
> for a second, it
> programs fine then.  I have checked the PIC isn't
> damaged - it does
> exactly the same on 2 different 16F87s.  It only
> apears to happen with
> one particular project - all other projects work
> absolutly fine.
> 
> Also, when using the ICD2 in debug mode, after
> pausing the program
> once, if I try to restart the program, it keeps
> saying the target
> isn't in debug mode until I pull the plug for a
> second.
> 
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