Добрый день!
При програмировании проявляется сообщение:
ICDWarn0033: You have selected Internal MCLR and Internal Oscillator in your configuration settings. If your code makes use of port pins that correspond to Clock and Data pins in programming mode, you may not be able to reprogram your device. See on-line help for this warning for more information. (OK/Cancel)

В справке:

When Internal MCLR is used with MPLAB ICD 2 for programming, both Vpp and Vdd are powered together, and then Vpp is pulled high to Vihh to enter programming mode. This means that your code will be running before Vpp goes to Vihh. If that code makes use of port pins that correspond to Clock and Data pins in programming mode, there is a chance their values may not be 0, as necessary to enter programming mode. Therefore, the device could not be reprogrammed.

Click OK to continue programming or click Cancel to cancel the programming operation.

Если я правильно понимаю , то приданной конфигурации ICD2 не гарантирует последующее перепрограмирование чипа?

Da, vi ponimaete pravelno, esli Vash kod chto-to delayet s pinami clock and data pri vkluchenie chipa, vozmozhno chto ICD ne smozhet vivesti chip na programmirovanie. Estessno chto esli pomenat konfiguraciyu, chip programmirovat opat mozhno budet.